FPR needed query?
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From: The Shenandoah Valley
FPR needed query?
Fuel Pressure Regulator.
I have a good one that I only ever bought because the 7psi stock mechanical engine mounted pump on my '77 was over powering the inlet needles in the Edelbrock carburetor when first used a few years ago. It was causing a flooding of the float bowls at low demand. For near 30 years on the same truck, through several fuel pump replacements, I never had an issue needing a FPR with the Holley nor the stock MC 2 barrel. With other cars, to my knowledge, fuel pressures were lower than 7 psi. Ford didn't think it needed one either, and 7 psi is spec. Now I've gotten used to it, and have it, but the way my fuel line runs, have no really great place to put it. I'm inclined to just put it away in storage with the Edelbrock.
I guess I'm just asking if anyone reading this has ever had ... or heard of ... a FPR being needed with other than a modern Edelbrock at 7 psi?
I can see it if running a high pressure electric pump. Every inlet needle, seat, and float combination has a limit.
I have a good one that I only ever bought because the 7psi stock mechanical engine mounted pump on my '77 was over powering the inlet needles in the Edelbrock carburetor when first used a few years ago. It was causing a flooding of the float bowls at low demand. For near 30 years on the same truck, through several fuel pump replacements, I never had an issue needing a FPR with the Holley nor the stock MC 2 barrel. With other cars, to my knowledge, fuel pressures were lower than 7 psi. Ford didn't think it needed one either, and 7 psi is spec. Now I've gotten used to it, and have it, but the way my fuel line runs, have no really great place to put it. I'm inclined to just put it away in storage with the Edelbrock.
I guess I'm just asking if anyone reading this has ever had ... or heard of ... a FPR being needed with other than a modern Edelbrock at 7 psi?
I can see it if running a high pressure electric pump. Every inlet needle, seat, and float combination has a limit.
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Joined: Feb 2004
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From: The Shenandoah Valley
I think it's perfectly fine without a FPR on the Holley, was curious if anyone had a different experience.
Carb Class: 5 Basic Carb Tuning Tips - Holley Motor Life
Updated 11162023:I made my bracket, but before connecting the FPR, I tested fuel pressure, it was 7.0 psi. I then replumbed some hose, tested it knowing that the FPR was last used with the Edelbrock and set to 5.5 psi ... and today it was still showing 5.5 psi. I then adjusted it to 6.5 to make the Holley tech folks happy, and readjusted my F&R float dribbles. I decided to do after finding a notation some place in Holley literature that a FPR immediately before the carb can "smooth" pulses from the pump. I don't know if true.
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