I originally put a deadhead regulator on being I had a Edelbrock carburetor which likes the 5# pressure after finding a aftermarket pump rated at 6-8. I'm now in the process of installing a Holley 12-881 with return line so  being it doesn't have a check valve, when engine shuts down it will bleed back because that's where the build up is in line from pump to regulator  . With a pump rated at 6-8# how would I not need a regulator ?

Last edited by bolake (9/11/2026 5:06 AM)

rpm wrote:

I have a Carter M4009 mechanical fuel pump with the attached filter, and added have used a pressure gauge for years. After seeing the fuel pressure fluctuate from the required and set 6½ pounds, I addded a a Holley fuel regulator. I installed it with a dead head fuel line, which has worked successfully so far. I later found many online complaints of the Carter QC of the fuel pressure.

         Yes that's what I found with the Edelbrock fuel pump that's suppose to be compatible for there 5# carburetor pressure when I reviewed it ,some reviews say  they had 6+. I'm just finishing up installing a   Holley with return. I had a deadhead that was ok  at set 5.5 engine running but would get the pressure build up from carb to regulator after engine shut down.