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Carburetors Carb discussion and questions. Upgrading your Third Gen's carburetor, swapping TBI to carburetor, or TPI to carburetor? Need LG4 or H.O. info? Post it here.

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Old 12-09-2011, 07:47 PM   #1
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holley fuel pressure regulator problems

I just finished my tbi to carb swap and im using the stock tbi pump in tank and using a return style holley fuel pressure regulator. my problem is not matter how much i screw or unscrew the adjustment on the regulator it stays the same. wont drop or raise pressure at all. i have a guage mounted on a brasss Tee that is screwed in to the regulator and feed fuel line. i have the return hooked up right. obvisouly its gotta be a problem with the regulator right guys? also when i leave my alternator unplugged the fuel pressure sits around 7psi i noticed this cuz i accidently had it unplugged and plugged it back in and thats when the pressure went up to 12 psi or so. im using a edelbrock carb 750 which is sorta big for my 350 but i plan on gettin it tuned right soon.
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Old 12-10-2011, 08:04 AM   #2
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Re: holley fuel pressure regulator problems

heres the problem, the tbi in the tank is way too much pressure for a carb. I had same thing. theres only 1 pressure regulator that summitt racing sells I think its a mallory that will regulate from like 35-40 pounds down to 5. its around 100$ or more. what you can do is get a holley blue or red electric pump, or use a mech pump on the side of the block w/ your regulator.it sounds like you drive it on the street, any street carb should'nt have no more than 5-6 psi. check your floats while @ idle. I left stock pump in tank and pulled the fuse to the pump. and ran a mech pump.since than I bought a holley red pump/ reg but have'nt installed it yet.
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Old 12-10-2011, 09:18 AM   #3
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Re: holley fuel pressure regulator problems

thanks for the info, i thought the TBI pump only put out like 15psi so i figured that this regulator would regulate that down to a desirable carb psi. i think im just gonna return this regulator to summit since it also started leakin around the top plate of it where you adjust the pressure. i think il just do what you said and get a mechanical pump.
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Old 12-10-2011, 11:43 AM   #4
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Re: holley fuel pressure regulator problems

tbi pump is about 20psi. unless its been replaced. most replacement pumps are 40ish psi. regardless, any return style regulator should be able to handle it. most common problem with regulators not adjusting pressure right is a cloged return line.
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Old 12-10-2011, 11:43 AM
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