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Discussion Topic:
Fuel Pressure Regulator Adjustment
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sarahcecelia |
04-11-2021 @ 4:06 AM
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Senior
Posts: 1171
Joined: Mar 2013
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It is my belief (memory) that the a flat head V8's fuel pressure(with a 4 barrel Holley carburetor) should be regulated to 2+1/2-3 pounds, and never over 3 pounds. Is my memory correct ? Regards, Steve Lee
This message was edited by sarahcecelia on 4-11-21 @ 7:42 AM
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trjford8 |
04-11-2021 @ 7:21 AM
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Senior
Posts: 4203
Joined: Oct 2009
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Memory is correct for the stock 2 barrel carb, but not for the 4 barrel.
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sarahcecelia |
04-11-2021 @ 7:42 AM
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Senior
Posts: 1171
Joined: Mar 2013
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What range fuel pressure would a 4 barrel Holly 390CFM carburetor need on a V8??
Regards, Steve Lee
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JayChicago |
04-12-2021 @ 9:44 AM
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Member
Posts: 474
Joined: Jan 2016
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It only "needs" 2-1/2 to 3 psi to function. Just needs enough pressure to move fuel to the carb as fast as the fuel is being used by the engine. Just needs to keep the fuel bowls full. However, that is a hot rod carburetor, could handle more pressure. I think could handle up to about 6-7 psi, maybe more. I have that Holley 390 CFM carburetor on my flat rod, and have the fuel regulator set for 4 psi. Delivers enough fuel for fast acceleration and expressway speeds. No need to have a higher pressure. If I was doing quarter mile racing I might want to raise the fuel pressure.
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sarahcecelia |
04-13-2021 @ 4:25 AM
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Senior
Posts: 1171
Joined: Mar 2013
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Aha! Holley says 5-7 pounds for their 390 CFM on a flathead V8!
Regards, Steve Lee
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