What's fuel pressure supposed to be?

[89Vette]

There's a downloadable fsm somewhere? Didn't think user manuals showed fuel pressure.

I'd have to think 48-55PSI is the unregulated fuel pump pressure. If correct, mine may be low. Still might be high enough for the ODB2 computer to compensate though.

[Y33TREKker]

Those pressures were actually taken from a downloadable Isuzu Workshop/Repair Manual, not a users/owners manual.

2000 Isuzu Workshop Manual

And from this thread; http://www.vehicross.info/forums/showthread.php?t=20985

My initial search term was "fuel pressure", and when following one of the "fuel pressure regulator" search results, I saw a link that said "fuel system diagnosis". After that I used "fuel system diagnosis" as my search term, and the fuel pressure readings were listed under a few different topics.

Most of the results were in section 6E - Engine\ 6VE1 3.5L Engine Driveability and Emissions.