fuel regulator? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

renagadebee34 · 01-14-2009, 11:51 AM

i have a electronic fuel pump that pumps 7psi. Do i need a fuel regulator? I uncle has a 79 ford with a 460 and he has a fuel regulator and its running just under 6 so it got me thinking?

piecesparts · 01-14-2009, 12:06 PM

Many suppliers tell you that one is not needed, but the use of one may keep you from having a flooded carb some day. Your choice.

James McClure · 01-14-2009, 12:16 PM

Carbs usually run around 10 to 13 PSI, so if your running a carb I don't think I would worry about it to much, especially if it is running ok. jim

*78 Chevyrado* · 01-14-2009, 03:07 PM

What kind of carb? if it's an edelbrock, 5.5psi max

James McClure · 01-14-2009, 03:41 PM

OOPS!!! I stand corrected. I was looking at TBI pressures. Quad is 7.5 to 9 psi. Renegade should still be OK where he is at if he is running a quad. Sorry, jim

renagadebee34 · 01-15-2009, 03:05 PM

im running a edelbrock 750

Pyrotechnic · 01-15-2009, 03:12 PM

Edelbrocks will tend to like less, and want 5.5 PSI, as said above. Every carb design has it's own specification for fuel pressure. It's possible you could get away with running a little more. If there is not problems with flooding, don't worry about it.

If you want to be sure, throw an inline gauge on the fuel line and see what you have.

*78 Chevyrado* · 01-15-2009, 03:25 PM

I had some problems with my edelbrock because of too much psi. but I have a 350 and with a 460 it wouldn't affect it as much. So like pyro said if it seems fine leave it. but If you want a regulator, I bought Holley PN 12-501 and it fixed me right up, made it act like a totally different carb. It's a 2 port regulator so you can mount a guage to it if you want to.

Here's mine, with guage.

renagadebee34 · 01-16-2009, 12:09 PM

it floods really bad and smokes really bad but for some reason it wont run off choke

87c10slammer · 01-16-2009, 02:03 PM

yeah a fpr would be a really good idea.. i put one on mine when i swapped it from tbi to carbed cause well 12 psi is way to much but i have mine set for 6psi and i never have problems with it starting..

*78 Chevyrado* · 01-16-2009, 06:13 PM

With too much pressure, gas is forced out of the carb into the engine and really can't be compensated for, without a regulator. once you get a regulator set to 5-6psi the carb will need to be retuned. If you haven't changed any jets, needles or springs, they should be fine, but if you have changed them, once you reset the pressure all that will be wrong. Any time the pressure is changed, it screws up every setting. The carb should be set up for a 350, so if you have a 350 set it back to how it came and that'll be your baseline.

01-14-2009, 11:51 AM	#1
renagadebee34 Registered User Join Date: Mar 2008 Location: Big Sandy, Texas Posts: 81	fuel regulator? i have a electronic fuel pump that pumps 7psi. Do i need a fuel regulator? I uncle has a 79 ford with a 460 and he has a fuel regulator and its running just under 6 so it got me thinking? __________________ girls love guys like me!!!!!!

01-14-2009, 12:06 PM	#2
piecesparts Parts and more parts Join Date: Nov 2003 Location: Lebo, Kansas (middle of nowhere Posts: 6,821	Re: fuel regulator? Many suppliers tell you that one is not needed, but the use of one may keep you from having a flooded carb some day. Your choice.

01-14-2009, 12:16 PM	#3
James McClure One shot, one kill. Join Date: Dec 2007 Location: Saratoga Springs NY Posts: 859	Re: fuel regulator? Carbs usually run around 10 to 13 PSI, so if your running a carb I don't think I would worry about it to much, especially if it is running ok. jim __________________ 1984 K20 350M engine with 465,000 miles. Well, it's finally done!! Almost 2 years of work, but it was really worth the effort. Little stuff left to do is mount winch, wet sand & buff out and build belly pan\running boards. Body work takes lots and LOTS of beer!!!! God, Guts and Guns made America and God, Guts and Guns will preserve it! The worst thing you could do is get into my sights, but that don't matter, you'll never know it, cause you'll never hear the shotJim or Paladin whichever you choose.

01-14-2009, 03:07 PM	#4
78 Chevyrado Account Suspended Join Date: Dec 2007 Location: Unnapreciative, Trollville Posts: 2,079	Re: fuel regulator? What kind of carb? if it's an edelbrock, 5.5psi max

01-14-2009, 03:41 PM	#5
James McClure One shot, one kill. Join Date: Dec 2007 Location: Saratoga Springs NY Posts: 859	Re: fuel regulator? OOPS!!! I stand corrected. I was looking at TBI pressures. Quad is 7.5 to 9 psi. Renegade should still be OK where he is at if he is running a quad. Sorry, jim __________________ 1984 K20 350M engine with 465,000 miles. Well, it's finally done!! Almost 2 years of work, but it was really worth the effort. Little stuff left to do is mount winch, wet sand & buff out and build belly pan\running boards. Body work takes lots and LOTS of beer!!!! God, Guts and Guns made America and God, Guts and Guns will preserve it! The worst thing you could do is get into my sights, but that don't matter, you'll never know it, cause you'll never hear the shotJim or Paladin whichever you choose.

01-15-2009, 03:05 PM	#6
renagadebee34 Registered User Join Date: Mar 2008 Location: Big Sandy, Texas Posts: 81	Re: fuel regulator? im running a edelbrock 750 __________________ girls love guys like me!!!!!!

01-15-2009, 03:12 PM	#7
Pyrotechnic Registered User Join Date: Feb 2007 Location: Austin, TX Posts: 3,930	Re: fuel regulator? Edelbrocks will tend to like less, and want 5.5 PSI, as said above. Every carb design has it's own specification for fuel pressure. It's possible you could get away with running a little more. If there is not problems with flooding, don't worry about it. If you want to be sure, throw an inline gauge on the fuel line and see what you have. __________________ 1977 GMC Sierra Grande Last edited by Pyrotechnic; 01-15-2009 at 03:12 PM.

01-15-2009, 03:25 PM	#8
78 Chevyrado Account Suspended Join Date: Dec 2007 Location: Unnapreciative, Trollville Posts: 2,079	Re: fuel regulator? I had some problems with my edelbrock because of too much psi. but I have a 350 and with a 460 it wouldn't affect it as much. So like pyro said if it seems fine leave it. but If you want a regulator, I bought Holley PN 12-501 and it fixed me right up, made it act like a totally different carb. It's a 2 port regulator so you can mount a guage to it if you want to. Here's mine, with guage.

01-16-2009, 12:09 PM	#9
renagadebee34 Registered User Join Date: Mar 2008 Location: Big Sandy, Texas Posts: 81	Re: fuel regulator? it floods really bad and smokes really bad but for some reason it wont run off choke __________________ girls love guys like me!!!!!!

01-16-2009, 02:03 PM	#10
87c10slammer truck addict Join Date: Apr 2008 Location: levittown pa Posts: 154	Re: fuel regulator? yeah a fpr would be a really good idea.. i put one on mine when i swapped it from tbi to carbed cause well 12 psi is way to much but i have mine set for 6psi and i never have problems with it starting.. __________________ trucks

01-16-2009, 06:13 PM	#11
78 Chevyrado Account Suspended Join Date: Dec 2007 Location: Unnapreciative, Trollville Posts: 2,079	Re: fuel regulator? With too much pressure, gas is forced out of the carb into the engine and really can't be compensated for, without a regulator. once you get a regulator set to 5-6psi the carb will need to be retuned. If you haven't changed any jets, needles or springs, they should be fine, but if you have changed them, once you reset the pressure all that will be wrong. Any time the pressure is changed, it screws up every setting. The carb should be set up for a 350, so if you have a 350 set it back to how it came and that'll be your baseline.



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