How quickly should your fuel pressure drop off when the pump is stopped. I have a homemade double pumper and trying to see if the check valve is bad in the pump(s). My gauge drops rather quickly.

 

i done know for sure... mine holds pressure for awhile...
maybe 2 or 3 mins. would have to check to be sure.

 

Ok mine at 2 min goes to 20 psi and at 9 min it goes to 0 . Trying to track down a lean issue and want to make sure that Is normal.

 

sounds normal. the drain back valves don't really hold pressure, they just keep the system from emptying.

 

yep... sounds normal to me too....

can you read your fuel pressure off the rail?

filter clogged?

 

Sounds good guys. I was just paranoid that I had a bad pump or leaking Injector. It's still in the 12s up top but I had it dead nuts at 11.8 last time I had the car out. It randomly dropped 20psi if pressure when I went to drive it but I found a broken spring in the regulator. Got it changed out and it actually holds pressure a longer now.