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Author Topic:   Fuel Pressure
Dirt Roller

Total posts: 21
posted October 11, 2001 12:23 PM
I am putting a Chevy 350 (planning to run hobby stock class) together for next year and was wondering what type of fuel pump, and or fuel pressure you guys recommend. Rules require a quadrajet carb, and mild cam with around .450 lift. I have 441 heads and a stock cast iron intake.

Some retailers have told me I will need a good pump to supply a lot of fuel, recommending a Carter style pump with about 7 to 9 psi. Then I was talking with a carb guy who told this will be to much pressure for the quadrajet and said I would need a regulator to keep a constant supply of fuel around 4 to 5 psi.

Motor has not been started yet, I am just trying to do things right the first time. Any suggestions, or if any of you can clear this up it will be greatly appreciated.

Dirt Maniac

Total posts: 166
posted October 11, 2001 10:54 PM
I run a carter pump with 6 lbs of pressure,
I dont use a regulator.I run a holley 4412.
works fine.

Dirt Full Roller

Total posts: 33
posted October 12, 2001 06:36 AM
I do not run a regulator on mine either,I run a carter pump and a holley 2300.Have'nt had any problems there yet.

Dirt Freak

Total posts: 219
posted October 12, 2001 08:32 AM
I work at a parts store, and have sold a few of the carter pumps to my fellow racers with no prob. Actually believe it or not, there is a hand full of superstock guys that run 4barrels sucessfully off of the old stock carter pumps. M6624.

Dirt Forum Racer

Total posts: 98
posted October 12, 2001 07:36 PM
You want about 4-7 psi for most carbs. Pressure up to about 9 psi is still OK with stock needle and seats, more pressure than that and you better have a pressure bypass.

Idling the pressure may be about 3-4 which is not a problem so long as it immediately jumps up over 4 when you bring up the RPM. If not you are gonna lean burn the pistons and will have a matching set of 8 paperweights or ash trays.

The Carter, Holley and Edelbrock units are all basically the same and are rebuildable. They also do not care where the inlet and outlet are clocked so if you need clearance for a fitting rotate the housing.

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