Thread: Plumbing fuel line

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Thanks for all the input.
I talked to Holley tech support for additional info.
1. They said I require a 80-100 micron filter between the fuel tank and the pump.
2. The fuel pump has to be lower than the fuel tank.
3. A pressure regulator is not required for the Red pump.
4. They recommend an oil pressure switch and relay to shut the pump off when the motor is off.

The cross member that I was going to attach the pump is connected to the frame on each side with 4 bolts as per picture.

Again, thanks for the input,

Bob

Make sure you run a return line to the fuel tank or your Holley pump will not live. It will run hot and eventually puke out on you. Ask me how I know.

Return line from where? Are you talking about injected motors? Don't know where you would put one on one with carbs.

Don

Holley Technician said I didn't need a return line for this setup (Red pump with Holley 600 carb).

I was referring to a return line from the fuel regulator or pump back to the tank. Holley pumps will run hot and die prematurely if you don't run a return line to the tank. I had a red Holley pump on my '32--it lasted two years before leaving me standed. Fortunately, it was only 20 miles from home. I replaced it with a Mallory unit, and after five years, it is pumping just fine. The Holley unit was always hot to the touch while the Mallory unit is not. I would rather have run a mechanical fuel pump but I have a pinched frame and a mechanical pump will not fit.

I've never used a return line with Holley pumps.

Originally Posted by clover47

Holley Technician said I didn't need a return line for this setup (Red pump with Holley 600 carb).

A lot of guys on the Chevy Talk Performance forum won't use Holley pumps and prefer Mallory, Carter, or Aeromotive. Now the newer Holley gerotor design is far superior to vane design of older-style pumps. They are not as noisy and have a longer service life.

I've never used a return line either. The one on my 27 was 7 years old when I tore the car down, and the one on my Jeep was 5 years old. The one on my 23 is now 3 years old, and none of them has ever failed. I do think I am going to go with a Carter on the next car, only because the Holleys can be noisy, some more than others. But open headers generally take care of that problem.

Don