Re: Mechanical fuel pump and electric is it possible?

Posted by BigKev On 2023/10/9 9:11:35

I have an electric pump inline with the mechanical. I only use the electric to prime the when the car has been sitting.

I've had no issues with the mechanically pulling fuel through the electric pump when it is off.

But, you have to get the right style electric pump for that to work. Impulse-style pumps work fine for that. Rotary pumps do not.

I have the pump wired via an under-dash switch and hooked to ON position on the ignition switch. I usually will turn on the electric pump until I can hear it pressurize the line (tone-change in the pump) and then turn it off. The car then starts on the first attempt, even after sitting for a couple of months in the Midwest cold, without any excessive cranking. Usually, in the first 2-3 seconds.