Have a question on fuel pressure. Ive been following some unrelated threads, but in those threads they spoke of waiting until fuel pressure builds up and the pump shuts off, about 20 seconds. My question, the way its explained its like the pump gets to pressure, then shuts off, but, does it at that point hold the pressure until the motor is started and consumes it, or will the pressure drop back to "0" unless you start it? I ask because by whats being said it seems like there trucks hold the pressure. My truck with a regulated return, has a gauge on the regulator. It goes to the 70psi I have it set too, but when the pump turns off, it slowly drops to "0". I cant find a leak. Truck runs great. Does it hold pressure? Or is my truck ok?

 

My fuel gauge pick up is post filter and when my pump shuts off my pressure drops to zero

 

It will bleed down.

 

Yes, that is perfectly normal. Once the pump shuts off, the pressure should fall off pretty quickly, down to zero.

 

Ok, thanks. I figured that with a return line and all. But the way I read those threads I was assuming there pressures held up.