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Bad fuel pump or FPR?
SR20DET Redtop, Walbro 255 fuel pump, stock FPR. Z32 fuel filter (replaced a few months ago). T25 stock boost.
Was driving home tonight from work and decided to get on the throttle a little bit. After reaching 4-5k range the car started to misfire, so I backed off and drove easy all the way home. Car drives perfectly normal until you enter the higher range RPMs.
So I got home and popped the hood and checked my fuel pressure. It was 32psi. I know this is pretty low since stock fuel pressure at idle should be 37.5psi. The FPR has its own vacuum source, nothing T'd off or anything. When disconnecting the FPR vacuum and the engine running at idle... my fuel gauge shows 46psi!
After seeing that the car was idling with 32psi of fuel pressure. I shut the car off, I went out to the garage 10 minutes later and was just checking everything out, then I noticed that my fuel pressure was now in the 40's range (so it went up!). With the engine off, if I prime the fuel pump the fuel pressure is around 43.5psi.
The Walbro fuel pump is around a year old, and after driving for 10 minutes or so, it starts to get noticeably louder in its whining sound.
I'm starting to think I need a new fuel pump AND FPR... LOL
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