fuel pressure head scratcher

[brownfinger]

Just installed B&M FP guage on top of filter. Started car. Got 45psi with vac, 55 without. Car is NON TURBO. Haynes says 38w/, 48w/o. Are either the guage or the manual known to be inaccurate? Pinched fuel return and guage shot up past 75psi. Pump's good! Do I need to replace my FPR, or is the B&M guage B&S? Also, my car is running like poop. Stumbles on acceleration in the low RPMs. Am I on to something?

 

[jrohner]

Do you have any kind of logger to see what's going on? Yeah, 48 is what it should be, not 55. I would think your fuel trims should be able to handle the pressure difference though to not be rich.

 

[brownfinger]

No logger. Finally decided to buy one, got paid, went to DSMloggers.com, and their website is AWOL. Then I found out about OBDloggers.com. They have an even better deal, and there website is still up, but the business is shut down due to an illness in the family! No luck.
The stumble upon acceleration is present after the car is warm, but it's worst when it's cold. Fuel trims aren't relevant in open loop are they?

 

[BrokenTsi]

Just because your fuel pressure goes up when you pinch the line doesnt mean your pump is good. A bad fuel pump could put out TOO much pressure.