FASS fuel pressure question.

[T Dye]

150/95(old model) FASS on my truck seems to start acting up when the fuel level hits exactly 9/16.

Q #1. Why would it have a hard time initially priming the fuel system at and after this fuel level?

Q #2. Why when I hit a small bump/pothole on the road will the pump lose some, if not all, fuel pressure? Only happens with small bumps, big ones don't affect the pressure for some reason.

I have checked the wiring, everything appears fine. My thoughts were, A. The pump motor is going bad or, B. There is something wrong with the pickup tube inside the tank. Any insight is appreciated.

Thank you in advance,
Travis.

 

[Samaras Diesel]

draw straw isnt long enough?

 

[skilletky]

check yer fuel line from the tank to the pump real good. mine was dryrotted some and was sucking some air. there for a while, when i first turned the pump on, it would not build pressure until i started the truck. it was something inside the pump. FASS sent me rebuilt unit. been fine ever since