Author Topic: Fuel Pump help requested (Read 7138 times)

RJ7868 · « **on:** October 13, 2007, 03:24:46 PM »

I am currently running a Holley Red pump with a regulator and a Rochester Quadrajet Carburetor in my 1984 Vet, right up the front left of my engine bay.

The fuel pump is very noisy and can be heard over the top of the engine at idle.

I would like to change the fuel to something that may not need to regulator and the pump nice and quiet.

Does anyone have an idea which would be best?

I have been told that both the Holley red and blue would do the job but may also be a little noisy still.

RJ7868 · « **Reply #1 on:** October 14, 2007, 11:50:32 AM »

It was susgested to me that I should be using a Corvette Fuel Pump, High Volume. Would this make sense?

http://www.ecklers.com/product.asp?pf_id=33142&dept_id=1762

Cameron 77C3 · « **Reply #2 on:** October 14, 2007, 12:33:42 PM »

RJ, what is confusing is this statement

"I would like to change the fuel to something that may not need to regulator and the pump nice and quiet."??????

MADVET · « **Reply #3 on:** October 14, 2007, 01:42:04 PM »

RJ, as your car is running a carby now you need a pump that will deliver the fuel to it at about 6-8 psi.
The pump that was suggested to you is for an EFI system and is probably about 50-60 psi.
The ideal quiet pump for your car would be a mechanical pump which is mounted at the bottom right hand side of your motor. The problem though is that there isn't enough clearance between the chassis, block and steering rack in a C4 for one.:(

So basically you're stuck with having to run an electric one. The thing about the holley red and blue and many other electric pumps is that they are designed to push the fuel not pull so they should be mounted at the rear of the car level with or lower than the bottom of the fuel tank. Failure to mount them this way will lead to premature pump failure.
I would suggest running a mallory electric pump as they are quieter than the holleys and are much more reliable.
Something like this;

http://www.vpw.com.au/productgroup.asp?CatID=6&SubCatID=317&priorCatID=317&PrdGrpID=2268

Another thing also is don't mount the pump solidly to the car, a rubber pad sandwiched between the pump bracket and body will help insulate against vibration, just make sure you have hooked up an earth wire to a solid earth.

:x

RJ7868 · « **Reply #4 on:** October 14, 2007, 02:52:49 PM »

Cam,
I will try again, in english:

"I would like to change the fuel pump to something that does need a regulator, and the fuel pump is nice and quiet"

Madvet,
Thank you for this piece of advice. I will look into that type of pump and the possibility of moving it to the back of the car, near the fuel tank.
With the Mallory electric pump set at 7psi, will this starve the carby when under full throttle? I do have a heavy foot sometimes...;)
I would like to cruze sometimes, but other times I will just like to drag from the lights or up my street. Maybe with some rubber letting go.........;35

TPI-383 · « **Reply #5 on:** October 14, 2007, 11:14:50 PM »

RJ,
From memory Q-Jets do not like more than 6psi fuel pressure or you can blow fuel past the needle and seat and the carb will flood, I had a carter electric pump on my VB Commodore with an adjustable Holley regulator that was set at 5psi and it fed 300 hp at the wheels without a problem.Pressure is not the concern,flow(voloume) is, good size fuel lines (3/8 in. min) are a must for good flow. The Holley pumps are piston pumps I think where the carter is rotary type. The carter pump was very reliable and not too expensive and came with all mounting brackets and screws.It was not very loud when running.
TPI-383