General Category > Quadrajet Carb Talk and Tips

Do I need a better pump.

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77cruiser:
I have this one.

https://www.summitracing.com/parts/crt-m6900/overview/make/chevrolet

But I have 5.5 psi at idle but drops to 3 psi at WOT. That checking at the pump not the carb so it could lower at the carb.
Stock 3/8 line from tank, 1/2 inch pickup in tank no sock to plug.

qjetsrule:
according to holley's calculator, that pump will supply a 1000hp engine. unless you got a bad pump, something else may be wrong. good luck

http://documents.holley.com/techlibrary_fuel_pump_tech_info.pdf

Cliff Ruggles:
I tried one of those pumps decades ago and found it to be little if any better than a stock pump.

It would NOT keep up with the 428 engine only making about 400hp that was in my car at that time.  I was trying to feed it with stock lines and modified pick-up as well.  Not sure if it needs bigger lines, or what was going on but I removed the pump and went to an electric pump and things were fine.......Cliff

77cruiser:
I know the pump should supply more than what I have. I thinking restriction before the pump.

Jeffs68:
Are you having a drivability issue, is the carb running out of gas, or are you just worried about the pressure drop?

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