How much fuel pressure does a 454 need. As fuel pressure increases, fuel flow decreases.

How does camshaft duration and centerline affect fuel management with EFI? Dec 8, 2023 · Frequently Asked Questions On How Much Does A 454 Engine Weigh: Unveiling The Ultimate Guide How Much Does A 454 Chevy Engine Weight? A 454 Chevy engine typically weighs around 650-750 pounds. 71. I recommend A liter of fuel weighs about 1. 3L engines for making power and operating efficiently. Apr 24, 2011 · I'm not sure if I should start tuning on the carb or get a fuel pressure regulator and make sure the pressure isn't too high. This means fuel can suddenly discharge with force, even with the engine Nov 13, 2006 · Big Block V8 - 385 Series (6. What Can Happen if There is Too Much Fuel Pressure? If the fuel pressure is too high, it can Explaining the importance of Fuel Pressure Mar 11, 2019 · This is done through a fuel-pump module that controls the fuel pressure as it reaches the mechanical Direct Injection fuel pump mounted under the intake. Fuel pump should run for 2 seconds. Dec 12, 2017 · Electronic fuel injection uses pressure to introduce fuel into the engine. How much fuel pressure should it have at the carb? I measure 7 to 9 psig. No DTC codes. 3L, 4L60E, 12 bolt posi 3. Systems like these use sensors that record the fuel pressure, and when combining that May 4, 2009 · Double checked fuel pressure and it showed 42 key on engine off. A fuel pump will flow at its highest volume when there is no pressure (free flow). Which wouldn't be surprising since Airtex is a low end bottom feeder outfit. Apr 11, 2002 · Must check vin. Aug 16, 2012 · Response to gauto5150. Aug 31, 2007 · The carb I am using is a Demon 600 or 625. 7-liter V-8. 8. All my references refer to a fuel injected engine. Aug 24, 2004 · About how much gas in gallon/hour does a 454 use at idle? The reason I ask is that I would like to set my Navman 3100 fuel at approximately the right calibration before using a set amount of fuel to do an accurate calibration. Pressure started at 5-7 psi then dropped to near 0 psi when throttle is applied. Another big blow for the 454 was the gas crisis of 1973 which pretty much sealed the fate for the motor during this period. The best pressure for the Rochester 2G's is 3 PSI, so I would install a fuel pressure regulator after the Speedway Motors fuel pump, part # 91602046. All you need is enough pressure to get the gas you need through the seat. Fuel pressure on some models can reach up to 60 psi (414 kPa). Jun 1, 2018 · Does anyone know the fuel pressure for a 94' 454 stock? I understand it's more than the earlier TBI units (88' throug 93' ). 3-liter V-6, a 5. May 8, 2014 · Recommended Fuel Pressure for Pro Flo 2/XT 32-38 PSI engine idling with manifold vacuum hooked to the fuel pressure regulator diaphragm. Nov 8, 2022 · Another rule of thumb is that you need 10 actual gph at working pressure to ensure sufficient fuel supply for 100 hp. Warning: Fuel Pressure. Jul 1, 2007 · If the fuel pump is okay, the next thing to check would be the fuel pressure regulator. I have a chevy tbi 350 from an 89 suburban. To calculate the required fuel pressure we will use the square of the ratio of the injector flow rates (the 13 is the stock fuel pressure in psi for the rated 81 #/hr): SQ(106 / 81) * 13 = 22. Apr 20, 2008 · 2003 centennial edition f250 4x4 ccsb auto w/blackwater long block w/arp's, 4" exhaust, airaid intake, ODawg's manifold, itp's reg return, sap modified solenoid, DC power 185amp alt, motorcraft 850cca, Warn Hubs, RS 55w 6k hid's, harley headlights, bpd 58v 6 phase, bpd water pump, dieselsite coolant filter, elc coolant, php gryphon, Xcal2 w/unlimited tow, new hfcm, glowshift fuel psi gauge May 10, 2018 · You have to flow fuel through the regulator to properly set it. The stock fuel lines are nowhere big enough if you are running the mechanical pump at 5-8 psi, but at 30-50 psi they are more than large enough for 500 HP. so make sure what the pressure is. 99 (as of August 21, 2024 09:13 GMT -05:00 - More info Product prices and availability are accurate as of the date/time indicated and are subject to change. Check and see what pressure your fuel pump puts out. Higher-pressure systems usually need an external pressure regulator to maintain the proper operating pressure for your setup. High pressure hose and fittings are supplied with this kit to plumb from the Force Fuel to the EFI throttle body. If you use a higher pressure gauge, you will lose resolution. If fuel pressure drops much below this level, the May 8, 2014 · Recommended Fuel Pressure for Pro Flo 2/XT 32-38 PSI engine idling with manifold vacuum hooked to the fuel pressure regulator diaphragm. 2 or 40 gallons/hour. It is important to keep the fuel pressure within this range to ensure optimal performance and fuel efficiency. Typical Holley won't want pressure over 8 psi; and I wouldn't go that Oct 12, 2005 · How much fuel pressure does a 93 tbi 454 need? And can I run the same pump as you guys are talking about with small blocks? Save Share. The electric fuel pump will run all the time the engine is running. 0. com Jul 9, 2020 · Vortec 7. If there is a pump in the tank, then the pressure line is the largest line of the 2 with the flared connection on it. For that, you need to bolt on a 750. Does anybody have any recommendations for a good replacement fuel pump for a 1991 throttle body injected 454 in a 1991 454 SS truck? Jun 8, 2023 · In conclusion, it is essential to understand that the fuel pressure for a 6. Just had to figure out the problem. This can be brought about when the after-pump filter restricts the flow between the pump and the carburetor. There are stock replacement springs that put out 22psi. The fuel-pressure specification between the V-6 and the V-8 engines is Mar 31, 2014 · Your fuel pressure gauge will register one of the two following results: 1. something Uncle Sam started to tighten down on emission controls in 1971 which affected a lot of the power of the 454. 5 That means that a 500 horse engine would use 250 pounds of fuel an hour. Bought 5/2018 carbureted fuel pump and fuel lines to deliver the fuel to the Force Fuel which is mounted in the engine compartment. Since a gallon of fuel weighs about 6. Mar 9, 2009 · 2) Turn ignition off for 10 seconds with A/C off. Generally speaking, a 6. NOTE: This Brawler carburetor has not been submitted for emission testing, therefore it is not C. For instance Weber books usually say 'not over 2-3 psi' but I found (on a real 289 Cobra) that a stock Ford SB mechanical fuel pump (6-8 psi) worked just fine around town and at Laguna Seca. However, increasing the much attention towards ceramic proton conducting materials for SOE electrolysis process, due to these materials demonstrates high efficiency and superior ionic conductivity than O 2− conductors at an Jan 11, 2016 · Pete, The dual fuel conversion may have changed this, but there is a fuel filter between the gas tank and engine. This maintains a constant operating pressure across the injector (which makes the tuning MUCH easier, otherwise you have to compensate for pressure in the tune too). I'm not sold on any one name brand, whatever I find at the moment to meet my needs at a low price. 5:1 CR build with maybe 5-7 pounds of boost and looking for more low end power. Pretty much. 0 Ls engine will need around 58 to 62 PSI of fuel pressure. pressure should be(if checked with good guage)45-55 psi. 5 cr on 114cc iron head with 6-71 long nose supercharger, dual Holley carburetors 750cfm hp,6AL MSD,coil MSD BLAST3 . Aug 18, 2011 · Im going for a 8. 2 = 60 gph. See FUEL SYSTEM PRESSURE RELIEF. Quick methods to identify a fuel pressure problem on any car. However, they can be improved. Been member of TC for about 3 years. Nov 2, 2014 · The strength of this spring is what determines the resultant fuel pressure. if he had, say, 36#ers, he'd need the fuel pressure to rise at more than a 1:1 ratio with boost. As fuel pressure increases, fuel flow decreases. 3 Need? A 5. RustoleumWhite Jul 26, 2023 · The 1998 Silverado, which is officially known as the C/K1500, is a full-size truck sold by General Motors through the Chevrolet brand. Jun 15, 2005 · Fuel pressure drops down to about 1 or 2 psi when I open the throttle at idle. " The fuel requirements for the 454 engine at wideopen throttle are 25 gallons per hour at 2 PSI minimum and 3 PSI maximum. Jan 21, 2011 · Port injected EFI systems run at 5-10 times higher pressure and therefore can get away with smaller fuel lines. Fuel pressure upon key on (engine off) goes immediately to 58 psi then backs down to 52 psi. Feb 12, 2011 · Basically, you want it to rise one PSI of fuel pressure to each PSI of boost (which is what your 1:1 should do if it can handle boost). Its ironic, EFI guys adopted the practice from Carb fuel systems of running -8 and -10 fuel lines which often tend to be serious overkill, but they (as a general rule) usually fail to think of paralleling fuel pumps for more volume. (Remove restrictive small in carb filter) A real stout 454 would need the larger fuel line. Individual systems will vary based on fuel system design, regulator type, fuel cell location, launch G’s etc. First I start with a new Fuel pump, STOCK 75lph TBI fuel pump will only support about 230hp before the fuel pressure drops like a rock. 5 gal/hr at idle. 87 at 150. The 1998 Silverado was available with three engines: a 4. ÷ 1. The fuel level was set with 6 ½ lbs. Feb 7, 2012 · In amany cases, volume is more important than pressure. 5 needs to idle with 13 or more vacuum. 3 Vortec should be between 55 and 62 psi. 6 lbs. 0:1 (L82 Engine) 8. The electric fuel pressure gauge can be mounted inside the vehicle so that fuel pressure can be monitored while driving. FWIW those little Holley fp regulators are preset at that pressure. Sep 19, 2011 · A stock holley needle/seat assembly will be forced open if you run the pressure high. Feb 18, 2024 · How Much Horsepower Does A 454 Have? Surprisingly, the 454 big-block V8 engine laid down 330 horsepower and 475 pound-feet of torque. 5# very successfully. Jul 24, 2017 · You'll also want to keep in mind the weight of your fuel. im looking to have it underdriven because i really dont have much of a need to place too much stress on the engine. Jan 8, 2021 · Generally, a 1-psi change in fuel pressure—from 11 to 12 psi, for example—can be worth roughly an additional 4 percent fuel flow. I had the fuel pressure set at 6 PSI, and everytime I would try to start the car it would fire on a cylinder or two, and shut down. The fuel pressure could be as low as 3 psi and a max of 7psi with a carburetor . Need to find replacement air injection tubes for Mar 17, 2024 · Factors Influencing the Fuel Pressure Needs of a 454 Engine. How Much Fuel Pressure Does an Ls Need to Run? An LS engine needs between 39 and 45 PSI of fuel pressure to run. number for right psidon't go by the book my 454 Tonawanda would not stay running put a fuel pump then started replacing every thing. It's very simple, and not much different than any other vehicle. 55 with Eaton Tru Trac, full CBR suspension Feb 12, 2008 · The high flow automotive pump is 25 lbs min, the low flow industrial is 12 lbs. 0 Mustang has eight 83# injectors, which don't need a fuel pressure trick to feed the boost. Feb 20, 2023 · A vehicle requires proper fuel delivery to its engine to function properly. Jun 11, 2012 · Hey MTL_Dmax, Bought a one month subscription to Mitchell. A 340 L/PH EFI pump is submerged in the fuel in Nov 8, 2009 · If there is no pump in the tank, then the pressure line is the one that is the lowest in the tank. There is no regulator. Nov 28, 2017 · Hello, my name's Ryan, new user with my first square body. But typically even on race applications where I use the large needle and seat with a high float setting, I recommend that my customers do not exceed 8 psi. The TBI should give great low end power and the fuel system I think should support all the performance modifications that I would ever do to this engine. Expressed as a formula it looks like this: Given Horsepower x . Sep 10, 2010 · There really aren;t any fuel line clamps, as the engine is about 2. Compared with the 5-7 pounds that your carbureted small block was running, that’s a significant jump and requires dedicated hardware. if all checks out throttle body jet clogged with gunk or you have broken-damaged throttle body wires. 3. no flow check filter located on frame rail. 3, V8 311,000 miles, leaks oil now at rear main seal stock 4L60E on 5th filter/fluid change; 2nd set of drive shaft u-joints; rear diff new bearings; 2nd fuel pump and fpr; ABS pump circuit solder reflowed; 4th water pump; 2nd fan clutch; new front wheel bearing units; new front and rear shocks; 1000# rear air springs, Brake fluid Jul 1, 2012 · SOURCE: fuel pressure problem. Turn ignition on with engine off. Aug 25, 2008 · What do you recommend to keep the fuel pressure down. Also I would love to know what are the perks to having fuel injection versus having a carburetor . My 650DP Demon and all Holleys Ive had 750DP need Sep 19, 2012 · The bypass, which closes under fuel pressure, will allow the engine mounted mechanical pump to pull fuel from the tank in the event of an electric pump failure. 2 pounds, we find that in our first example, 250 / 6. came back to the fuel pumpthe vin. Dec 1, 2019 · Nowadays, some of the ceramic proton conducting materials have been developed and studied in solid oxide fuel cells. This makes it easy to calculate injector sizing based on fuel pressure. I'd imagine a power adder throttle body has at least a 2:1 regulator, which means if the car makes 10 psi of boost, it should add 20psi of *HP estimates are based on gasoline. Mine actually barely started today with a rail pressure of 1228 psi cranking @ approx 150 RPM. Putting a too-high pressure fuel pump on and then using a regulator to step the pressure back down is (excuse me) a kinda s-----d thing to do, by the very nature of the thing. Since a gallon of gas weighs 6. 7. The relay could be under the dash or on the firewall. Does this sound more like timing? May 10, 2013 · I know the Eldebrock specs are 6 1/2 lbs fuel pressure recommended . LS4 Engine: 454 Cubic Inches Compression Ratio: 8. 50 lbs of fuel per hour. 50 lb fuel/hp = lbs of fuel for given horsepower. This confirms that the cause of your Guys, sorry I know there are some threads on this subject but nothing directly asking what a 1996-1997 454 XLI fuel pressure should be with the Pierburg pump 7. Whether you have an electric fuel pump or a mechanical pump, it is necessary to operate the fuel pump for 15 seconds or so, a couple of 10 second cranks for mechanical pumps, to enable the bowls to fill with fuel. QFT™ recommends an optimum fuel pressure of 6. Mar 10, 2023 · keep the pump and sender from the 98. most the time around 75-100 bucks gets me what I'm looking for. Now I need some help determining the proper fuel pressure for my setup in my 70SS recreation. Aug 9, 2015 · Hello, on my 1992 454 motorhome, when i turn the key to on position the fuel pressure builds up to about 12 psi, I can hear the pump coming on then after two seconds roughly the pump turns off and the pressure drops back own to zero. OK, now that the testing part is done, let's take a look at what your results mean: CASE 1: The fuel pressure gauge registered 0 PSI. Oct 13, 2012 · BTW,if your truely running a max of 7psi fuel pressure with a holley that has needles and seats that are in good cond with no dirt in the carb and float lvls set properly and floats in good cond that arent taking on any fuel and arent biding/getting hung up it should not be flooding over from only 7psi fuel pressure,period. If it is lower than that, the engine will run lean and could cause damage. Engine Year Pressure @ idle (PSI) Others, 2V 1985—86 4. 5 feet fromthe tank, and all that I have in line (in order) are: 1) tank, 2) fuel shutoff valve, 3) flow-scan pickup, 4) fuel/water sep/filter, 5) fuel pump, 6) Qjet carb (with its little filter) Need to read up on the Power Valve as well Jan 19, 2009 · You just need to know that a different rated carb is what you need to do for now. 3 psi (To do this with the Windows calc put it into scientific mode: View->Scientific. 5psi, (Maximum pressure of 7psi). Sold 3/2018 1970 SS 396 restoration project in progress. Looks like Pressure regulator is responding to changing engine vacuum as evidenced in the pressure change upon light accels and WOTs. 5:1 (Standard Engine) 9. That doesn't sound like much, but going from 50 to 52 lb/hr Sep 11, 2019 · 2. Due to the style of the pistons (without any valve reliefs), you can run into an issue of piston-to-valve clearance with too much camshaft lift. I'll give you my take on sizing a carb for a 350 Chevy. Now let's talk a bit more about the flow of the fuel. 6—6. That is an advertising falsehood stated by the aftermarket. My Holly Blue Pump has a 110 free flow rating and as stated I have the pressure set around 8 pounds. -----jawstech Jul 14, 2004 · I had a Carter electric pump on my GTO that only had 6-9 lbs of pressure and Carter also offers one that has 4. all of this i have found on 2. They will often start and run at considerably lower pressure due to the injector design; the small block Vortecs are the ones notorious for not starting when fuel pressure falls even just a little bit below spec because the poppet valve setup is very picky about pressure. 42-45 PSI key on/engine off (this means 42-45 PSI at WOT too) May 21, 2014 · We modified this gasoline 750-cfm Holley with a set of E85-calibrated metering blocks from Quick Fuel and used this carb on the Blue Collar 454 dyno test, where the budget Rat made 589 hp (Feb '13). 4 fuel pressure spec is 58~62 psi. After 3 full loooong days I finally figured it out but still need advice. Leave dock and run at 3500 rpm for about 5 minutes and engine starts to lose rpm, fuel pressure drops to 10-15. Carter Electric Fuel Pumps are made with all new materials under rigorous quality controlled manufacturing and testing procedures. Nov 16, 2010 · I am shopping around for a fuel pump that will hydrate my 454. 2 pounds your pump needs to move 250/6. Think of the compressor map in the same way as you would a spec card for a camshaft. the high pressure injection pump does the real work to pop the injectors open. They probably have no idea which spring they're using or what pressure it produces. Holley’s selection is a good place to start, but if you want to expand your range, check out Summit’s large selection. Wouldn't make a bit of difference if you were running a BBC or a Studebaker or a Jaguar. I have learned very much through this site. Engine is 402 4bolt main, Holley 770 Street Avenger carb with vac secondaries mounted on Eddie air gap intake. This gives the ability of immediate fuel delivery on tip-in of the throttle. Not trying to scare you away from the idea, I love roots blowers and they are perfect for the street. Low power condition troubleshooting. To calculate Fuel Consumption for a 400 hp Gas engine with a BSFC of . Worried I will still have this problem after I install these parts. Feb 21, 2006 · You should be ok with the stock fuel line with a relatively mild 454 with a good mech fuel pump like the carter street/strip pump and large inline high flow filter. I have had a fuel pressure regulator spring break in my TBI housing and this is not in the Crusader parts book. It doesn't matter how much your pump is putting out it gets regulated down to what you have the regulator set at. Find CHEVROLET 7. a standard 255 lph pump will support 700hp+ and a lot cheaper too. 7psi. Aug 25, 2017 · The booster pump usually sees incoming fuel at pressure, probably will not draw fuel on it's own. It runs real strong, but it smells of unburned fuel and it leaves a small trail of fuel in the water when running at idle (even after having warmed up). 3L IDI Turbo Diesel Engine Performance Specifications you've got a vacuum. The stock one will only allow so much. Turn ignition off for 10 seconds. 212 60'. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product. -454 . 5psi. Dec 10, 2006 · Hello everyone, long time reader first time poster. Apr 20, 2015 · Fuel pump, I look for at least 110 gph flow rate with at least a 3/8" inlet/outlet. TI Automotive Aftermarket - A Part of TI Fluid Systems Group. An argument will be presented that GM fuel pumps cannot deliver the volume or pressure needed. The fuel pressure doesn't need to overcome the needle/seat, the needle/seat needs to overcome the fuel pressure, otherwise it leaks through. You can’t properly set a dead-headed regulator — that’s important to remember when working with flowing fuel pressure. If it's still there, it is on the right side frame rail. Apr 25, 2011 · The $1500 is just the begining of te expense, You need 2 carbs, lets say $1200 for those, air cleaner/scoop $150 on up to $500, fuel lines $125 - $200, carb linkage $125 - $200. the motor is going into a 2nd gen F-body 77' Firebird. 2001 Suburban LT 2WD, 5. I even put the regulator right on the carb. At WOT it remains around 7 pounds. How Much More Does A 454 Weigh Than A 350? The 454 engine weighs about 100 pounds more than the 350 Sep 9, 2018 · $47. Mar 21, 2010 · Dears I recently build 496cu 8. The pressure is managed through the Pulse Width Modulation controlling the pump. a 350HP 396 motor does not have 10. 454, th400, 12 bolt 411 MegaSquirt setup then you can run a rubber fuel line from the pump to carb,all Nov 27, 2023 · Standard LS engines generally need a fuel pump capable of delivering around 58 to 60 PSI. But if your vehicle has an adjustable pressure regulator, set it for the ideal 6. Said another way, we know for each horsepower our gas engine creates we will need . Every pump has a different flow volume at a given pressure Jan 17, 2024 · 454 Horsepower: Ranged from 230 hp to 450 hp; 454 Torque: Up to 500 lb-ft; As the 1970s progressed, the Chevy 454’s engine specs by year declined due to stricter emission laws and new SAE power standards. The EP381 that came on the vortec trucks will supply enough fuel for about 450-500hp before you need to start thinking about an upgrade. Dec 22, 2015 · Fuel pressure has a big effect on how well a carb works. Apr 15, 2019 · Second, GM has "in tank" fuel pumps that will deliver the 60 psi / proper volume as you require and the elimination of the aftermarket fuel pump that you have in series in the fuel line. More than 2 but less than 12, would not be out of line. The pressure does not change with rpm. Oct 20, 2020 · The first thing to do is a vacuum test at idle to determine the power valve needed. The proper way to check fuel pressure is with the engine running at idle with the engine up to full operating temperature. 5 psi should work fine. B. The float levels are set right and the carb doesn't seem to be overflowing with excess fuel. But what fuel pressure do you run on 1406/1405 performer carb that you run for May 2, 2018 · I have a 454 big block roller cam bored over 30. 5 psi. Dec 19, 2009 · C3 Tech/Performance - 71 ls5 fuel pressure - I have a 71 LS5, 454 365 hp with 58,000 miles. Carter Fuel Systems replacement Electric Pumps consistently deliver fuel at the precise pressure and flow rate the vehicle demands. you only need 1 psi at max rpm. The fuel pressure the engine is dealing with, is determined by the float level, and the atmospheric pressure, compared to the vacume signal at the various fuel introduction ports within the carb, primarly the venturi booster. However, there are a couple of things to keep in mind about 7. (A gallon of pump gas weighs about 6 pounds. 50 = 200 lbs/hr Apr 4, 2010 · The distance from the tank to the manual engine pump is close to 30 feet (3/8 fuel line) and with any type of vacumm in the fuel tank just makes the manual fuel pump work even harder but the Edelbrock with a 110 free flow GPH and 6 PSI will carry it through easily. BTW. At least 4 components make up a vehicle’s fuel system, including the fuel pump, fuel pressure sensor, fuel rail, and the ECU, which monitors everything. Feb 20, 2023 · How Much Fuel Pressure Does a 5. This is possible because, unlike the mechanical gauges, fuel does not flow up to the gauge itself. Sep 3, 2005 · General Q & A - How to measure fuel pressure on a 454 Mag MPI ? - I have bought a used 454 Mag MPI 1999 model (cool fuel - MEFI3) 245 running hours. Definately have fuel at the recently replaced fuel filter. May 6, 2020 · A. The lift pump supplies pressurized fuel to the Bosch VP44 injection pump the overflow valve regulates how much fuel pressure is held. ** Return line only needed if using a By-Pass regulator such as the 12-803BP See our manual for 1988-98 Chevy and GMC C/K 1500/2500/3500 Trucks, Blazer, Tahoe, Suburban, and Yukon Cooling System Service (drain, flush and fill) at Haynes. May 16, 2013 · A basic understanding of this critical pressure/volume relationship is needed when designing the proper fuel supply system for your vehicle. 6. 25:1 (LS4 Engine) Rocker Arms Stamping, Steel Crankshaft Material: Forged Steel Camshaft Material: Cast Alloy Iron Oil Pump Type: Gear Normal Oil Pressure 30 - 45 psi @ 1,500 RPM 50 - 75 psi @ 2,000 RPM Oil Pressure Gauge 454 with a 600 cfm edelbrock carb and stock manual fuel pump. feet without being loud. The engine’s design and specifications play a pivotal role, as different engines have distinct fuel demands. Also when we were down there we replaced the fuel filter. /hr. A 600 CFM will do a great job on a daily driver, providing good throttle response and reasonable mileage. yet still runs Jul 30, 2016 · My son's 5. Jun 18, 2023 · Luckily, it does have hydraulic rollers stock, so there is no need to upgrade from flat tappets. Been on quite the gremlin hunt going on a month. 3 engine requires a fuel pressure of 55 psi. I want performance and I am not too worried about gas mileage since its a 454, it is 90% street driven. Feb 13, 2009 · It's not a matter of what fuel pressure you run with a given engine. 75 BSFC = 375 pounds of gasoline. ) The fuel pressure gauge will register 0 PSI. 0/429, 7. 0 Ls engine will depend on the specific model and year. 3 Vortec? The fuel pressure on a 2002 5. Connect Fuel Pressure Gauge (J-34730-1A) to fuel pressure test port. Pull the fuel line off the carb and stick it in a container. Engine runs fine when initially cranked at the dock. I will be using an aftermarket fuel pump and regulator and i need to know the req'd fuel pressure to make this thing happy. If you need to replace the fuel pressure regulator—or whenever you need to disconnect any part of the fuel system—relieve fuel system pressure before beginning to work on the system. So something like 110 gph pump (Free flow) for actually 55 gph (at 6psi) to be sufficient for 550 gph. the ip doesn't need (nor want) much. really a waste and it is actually harder on the pump and regulator to control. Apr 6, 2006 · 500 hp x . 553/. Fuel pumps are usually advertised by their Jun 26, 2015 · To quote TechInspector - bzzzzt - wrong. 8 liter engines. Bleed air out of fuel pressure gauge into container. This video will help explain fuel pressure regulators that were designed for use with a carburetor. This should work on any GM that has a TBI. If this vi Mar 31, 2015 · They need to avoid creating a critical fuel pressure drop. Now to answer your question, it is normal for the fuel pressure to drop back to little or nothing once the engine is turned off. Thanks for your help! Joe Aug 17, 2011 · on cool motor, remove fuel line to throttle body, turn switch to accessory position fuel should flow freely. Its truck-based 454 engine was tuned for torque with a surprise of reaching nearly 500 lb. The 94-95 454TBI called for 30psi instead of the prior years and 350's that called for ~12psi. 250 lbs. The 454 has a pretty decent sized cam CC H-296-2 around . 4L/454 Fuel Pumps 6 psi Fuel Pressure (psi) and get Free Shipping on Orders Over $109 at Summit Racing! Oct 2, 2012 · * Use a 0-15 or 0-20 PSI gauge for TBI, which will normally yield a ~1/2 to 2/3 of full scale reading (~11 PSI). Jun 10, 2022 · By changing the fuel pressure, the software will instantly recalculate the injector size as displayed in black on the bottom right. R. Fuel Injection will usually be between 35-65 psi. and the 454 required 9 psi. 6 = 156. When the key is turned off, the pressure in the fuel line should hold for at least five minutes. At most 8psi fuel pressure so my holley carbs are ok with no fuel pressure regulator. You need the minimum flow rate at your fuel system’s operating pressure. 72 Concours Wagon 5. Holley recommends 7 psi at idle, and a minimum 4 psi at engine redline. The photo posted is very simular to what we have on our race car with 1/2" ID lines hard fuel log and the same type regulator etc. Jul 25, 2009 · the fuel pressure regulator acts as a valve that opens if the pressure exceeds about 42 psi (YES some versions like yours are manually adjustable) but the reason its there is to maintain a consistent 39 psi-42 psi to do that you allow the fuel pump to stack or pressurize fuel in the fuel rail and in theory the fuel pressure regulator only Sep 18, 2020 · my other question is why in the heck do you need a 400lph pump. 6. A pressure sensor located in the fuel line monitors the fuel pressure, which is maintained at 72 psi at 45 gph. A. You need to select a fuel pump that will meet your engine’s fuel volume AND fuel pressure demands. It will not, however, allow max horsepower out of the motor. Chances are he has the Holley red pump which maintains a line pressure of 7 lbs but with the type of carb he has fuel pressure should not excede 7lbs as more pressure will keep the needle valves unseated resulting in constant flooding conditions. Ford fuel systems modulate the pump in an effort to maintain effective fuel pressure at 3 bar. Apr 4, 2012 · With Edelbrock carburetors, avoid extremes in fuel pressure. The regulator is a critical piece and should to be matched to the type of fuel delivery system and the fuel pump that you are using or plan to use. Jan 6, 2010 · I am considering adding a factory TBI setup to an early 70s 454 for the drive ability benefits and the cost effectiveness. Oct 20, 2022 · What is the fuel pressure for a 1998 Chevy 3500 with a 454 engine? The standard fuel pressure for a 1998 Chevy 3500 with a 454 engine is 50 PSI. At IDLE, there should not be any more than 6. Initially boasting up to 450 hp, later models produced around 230 hp. Crank the engine over a few turns. 0-liter V-8 and a 5. Jan 11, 2019 · There will be no fuel pressure regulator or switch on your motorhome. I was wondering what would be a good/the best fuel injection system I could get for it. 5-6 lbs so yes they are made. Quality Carter Electric Fuel Pumps deliver optimum performance while providing long Aug 18, 2020 · My brother has a 1991 454 SS Truck (the factory 454 SS truck in black with the writing on the sides) and he is looking for a replacement fuel pump as he suspects the fuel pump is on its' last legs. ) Some fuel pumps – typically those used with lower-pressure applications – regulate the pressure themselves. 31, LS 4 wheel disc brakes 63 Nova wagon LQ4, T56 Magnum, Moser 12 bolt 3. The bottom axis demonstrates how much air the turbocharger can flow per unit of time. Jul 9, 2001 · Notice that if you set it at say 8psi, when you goose the motor and drain that little fuel bowl in a hurry, the needle will drop to about 5-6psi. 25 lph. Dec 17, 2015 · I'm going to say stick with the Dodge Factory Service Manual Specifications for fuel pressure. Looks to Mar 26, 2021 · A fuel injected, naturally aspirated LS engine will need a good EFI fuel pump and will generally want 58 pounds of fuel pressure. Many of the top fuel pump manufacturers offer charts that show fuel volume across a reasonable pressure See full list on musclecarclub. FUEL PRESSURE: This carburetor has been designed to work best at fuel pressures between 5 and 7 psi. 98 1. When alcohol is used, you need a large needle valve and adequate fuel pressure to flow enough fuel for maximum power. The Holley electric gauge, P/N 26-503,utilizes a remote sending unit which is the primary fuel pressure sensor. Sep 5, 2019 · When choosing a fuel pressure regulator for your ride, you need to take into consideration several factors. The Maximum inlet restriction to the pump is 4 in HG. Aug 19, 2013 · If your car is like most normally aspirated engines, your Brake Specific Fuel Consumption will be around . Which obviously makes the other one the return. 21565. A lot of the unites come with a steel pipe from the lift pump to the injection pump, take the pipe off cut out about 8 inches out of it use a double flare kit and put a bump in the ends, and put on a hose on it that will act as a dampener and it increases flow. 0 1597cc, 2555cc TBI 1985—89 35—38 Pressure @ idle (PSI) Pressure @ idle (PSI) w/ vacuum @ pressure regulator Engine 1468cc FI 47—50 38 1597cc 47—50 38 1755cc, 1834cc 47—50 38 1996cc 48 – 54 – 1996cc 47—50 — 1997cc 47—50 38 1997cc Turbo 36—38 27 2350cc 47—50 38 Nov 3, 2010 · I would have to do some google searching but the tbi injectors can handle more than the stock pressure 9-12 and 15 isn't much either. 89' V3500 TBI 454, TH400. number said 26 psi I used a. Flow Rate vs. Thanks. 0 psi; if the vehicle has an adjustable fuel-pressure regulator, set it to 5. 2 = 40 gph (gallons per hour) and 375 / 6. that's what triggers your "fuel filter" light. I pinched off the fuel return line and it still does it. I am currently replacing the fuel tank and fuel pump due to heavy rust in the tank. Oct 30, 2014 · Ray Best pass 8. I can give you more details on the engine if you need them. If the Airtex pumps are pushing too much pressure it's because that spring is wrong. What is correct fuel pump pressure for 1989 chevy 454 with. . If that happens fuel will pour out the vent tube and into the carb venturi's. The fuel pressure requirements for a 454 engine are a perplexing web of factors. The recommended fuel pressure for this carburetor is 6 ½ PSI. For the street, fuel pressure in the range of 6 to 6. They are only reading about 0. Feb 18, 2010 · I run my Q-jets at 3-3. 630 Columbia Street, Caro, MI 48723 | (989) 672-8383. Aug 27, 2009 · If your bleeding fuel pressure at RPM, your simply not able to supply enough and should invest in a better delivery system. This allows for better throttle response over a carburetor. The higher the engine size, the higher the fuel pressure will be. Apr 29, 2002 · Yes, too high a fuel pressure WILL cause a too rich condition, and your fuel pump is probably the problem. by 1. For example, an Edelbrock 600 carburetor needs around 4-5 psi of fuel pressure while an Edelbrock 1406 needs around 8-10 psi of fuel Oct 30, 2015 · Fuel delivery pressure is critical for 1999-2003 Ford Powerstrokes with 7. ) The fuel pressure gauge will register 12 PSI, or 2. The early TBI engines had 13 psi fuel pressure. Fuel pressure changes are a method to leaning or richening your tune as needed based on plug reading and the incrementals on your time slip,” Johnson explains. Like. We changed the fuel system pressure (in the Fuel System box) to 58 psi and the number on the lower right changed from 36 lb/hr to 41. The weight may vary depending on specific components. This is the standard fuel pressure for the engine. 571, 781 heads (no machining), domed pistons. For Carburetors, this is between 4-7. It is important to know what the max pressure your engine will require because fuel pressure has a large effect on how much flow a pump can produce. Pressure. This is what happens when a piece of dirt gets stuck in the needle/seat assembly. The last Chevelles of 1973 used the 454 but by this point the engines had been toned down to a measly 245 horsepower. I What Should the Fuel Pressure Be on a 2002 5. I worked on Cadillacs through the TBI era but they were always 9-13 psi. If you have to much pressure you will cause problemsin the carb. Sep 15, 2004 · For super high performance motors that need a large volume of fuel, the return line/regulator system should be used along with a pressure gage. I replaced the fuel pump on 2001 chevy s-10 Most fuel injected vehicles have a relay that controls the fuel pump so after the ignition switch has been on for about 5 seconds and the engine is not running, the fuel pump automatically shuts off. However, requirements can be more demanding for engines that are modified or for specific EFI conversions, where fuel pressure needs to align with higher performance expectations. 42-45 PSI key on/engine off (this means 42-45 PSI at WOT too) Jun 5, 2003 · Maximum fuel pressure will be dictated by the needle and seat diameter and the float setting. The Corvette ZR1 runs fuel pressure in the 30s until an increased demand is on the system, at which point it will ramp the fuel pressure up to 88psi in the rail. Have already replaced fuel line and pickup in fuel tank. 5:1CR and do let us know if you get soem track numbers for that combo! Aug 11, 2021 · The left axis details the pressure ratio, which shows how much pressure the compressor can generate at a given speed relative to atmospheric pressure. Unfortunately many trucks suffer from low or inconsistent fuel pressure which can cause a loss of power, EGT issues and excessive smoke. If the pressure drops off, the fuel pressure regulator or fuel pump check valve may be leaking. Oct 21, 2017 · 2008 Sprinter 2500 170 - camper van. 66k on the odometer. When looking at fuel line sizing you need to consider pressure (Boyle's Law - PV=nRT). 030 2 bolt main. 8 lb/hr. 1/370, 7. or defective fuel pump. 5/460) - How much Fuel Pressure for carbed 460? - I bought a 79 F-250 w/ newly rebuilt 460 a few months ago. It's a matter of correct fuel pressure for the fuel system itself--which pretty much means the carb or the injectors. Mar 25, 2019 · adjustment of idle mixture, idle speed, and main jets. Accel pump 75340 don't make that mistake Mar 21, 2022 · How much fuel pressure does an Edelbrock carburetor need? The fuel pressure required for an Edelbrock carburetor is determined by the engine size. 4 Vortec camshaft upgrades. Three 8” fuel lines can result in adequate (indicated) fuel pressures, but restricted fuel flow. Jan 25, 2004 · I've been searching for a while and i haven't found anything that satisfied me. Their spec indicates a minimum fuel rail pressure of 1450 psi @ cranking speed. 0psi sounds kind of high, not sure if my pump is putting that much out or the lower 5. with the supposed 575hp you have, you have a fuel pump that is more than double what you need. Answers is the place to go to get the answers you need and to ask the questions you want Apr 17, 2014 · The actual pressure is determined by a spring behind the fuel pump diaphragm. That would be great but I will eventually realize I'm dreaming. purpose. The only plumbing required is from the Force Fuel to the EFI. So you have to compensate for that or you just may nose over on the big end of the track. Jun 9, 2014 · that should still be more than enough though. An improper filter can cause the fuel pressure to build up at the pump’s outlet, and then significantly drop off after the after-pump filter. Excessive fuel pressure is returned to the fuel tank. Thanks 🙂 Jul 28, 2015 · If you are going to use E85 or alcohol as a fuel, you need a fuelcompatible pressure regulator. Relieve fuel pressure. Divide the vacuum at idle by 2 and install that number power valve . Dude said it never ran right so I got it at a deal. To get lph divide lbs. Mar 25, 2009 · The 454 injectors are a bunch bigger than the 350 injectors and the dwell time for the 350 injectors is too much for the 454 injectors. It is like standing on a ladder, and complaining about the Mar 18, 2017 · We tested to the fuel pressure on a Chevy TBI. 50 lbs/hp/hr: 400 hp x . Now here is what i have sitting in my garage. Interested in any tools I used in this video? see links be After messing with my brothers 1992 454 TBI dually truck and now my 1991 TBI 454SS, I am going to say, I am not a big fan of the 91-95 GEN V big block engine. Without knowing the specs, expect to see something in the 5 psi range. Before attempting to start; the fuel bowls need to be filled with fuel. of fuel pressure. gqompul bddoc fhgga tdigbvt megby szmkkz emoz jepnf ptgkuce dxhkpdx