Re: Mechanical fuel pump and electric is it possible?

Posted by Digger Dave On 2023/10/15 14:29:25

I have a 6-volt pump in series and parallel with a normal fuel line.

I installed my pump with a switch used primarily for assisting if the car has sat for a while. After starting, I typically turned the electric pump off. BTW, when the pump has built up pressure, they typically don't make noise. They really only make noise while building pressure.

I also have a direct feed with a check valve mounted parallel to the pump so that the mechanical pump can pull through the check valve and allow the car to run normally. The check valve keeps the electric fuel pump from sending fuel back to the tank in the parallel line.

I did all of this for 2 reasons.
#1 I didn't want to for feed my mechanical pump and possibly cause a seal in the mechanical pump to fail and allow fuel into the engine.
#2 I didn't want to over pressurize, so I would have needed a pressure regulator, but that wouldn't have relived my worries of #1
#3 I like redundancy with a solid backup.

I used to have turned on the pump on long uphill pulls on my tired engine. I hope the rebuilt engine doesn't need the electric pump.