gmrulz4u Posted July 24, 2003 Report Share Posted July 24, 2003 I'm going to be buying a Fuel Pressure Gauge this weekend and I BELIEVE all I'm supposed to do to check it is hook the fittings up to the Schrader Valve, and that's it, right? Anyone done this before?? Quote Link to comment Share on other sites More sharing options...
Joe T. Squirrel Posted July 24, 2003 Report Share Posted July 24, 2003 Hey gmrulz4u, You're right - hook it up to the Schrader valve on the fuel rail. Watch out as fuel will squirt out of the valve as you try to hook it up - no smoking! You'll also have a small button to depress on the side of the guage fitting to release fuel pressure, if needed. I'm not sure what type vehicle / engine type you have so I can't give you exact figures on what PSI you're looking for, though. Good Luck, JTS Quote Link to comment Share on other sites More sharing options...
gmrulz4u Posted July 24, 2003 Author Report Share Posted July 24, 2003 Great, thanks man! I believe it's supposed to be 40-47 psi with KOEO... It's the 2.8L MPFI Quote Link to comment Share on other sites More sharing options...
Robby1870 Posted July 25, 2003 Report Share Posted July 25, 2003 yeah around 45psi should be right Robby Quote Link to comment Share on other sites More sharing options...
gmrulz4u Posted July 25, 2003 Author Report Share Posted July 25, 2003 Is that with just the KEY ON, or is that for both KEY ON and ENGINE RUNNING? Quote Link to comment Share on other sites More sharing options...
Robby1870 Posted July 25, 2003 Report Share Posted July 25, 2003 it should be pretty much the same either way, but the 45 is for running, I think Robby Quote Link to comment Share on other sites More sharing options...
Justin Posted July 25, 2003 Report Share Posted July 25, 2003 '91 3.1(probably all 2.8/3.1) Ignition ON Engine OFF 40.5 to 47.0 psi With Regulator Vacuum Applied [1] 3.0 - 10.0 psi Less than Ignition ON Engine OFF 3.4 same 95 3100 Fuel Pressure [1] 284 - 325 kPa (41 - 47 psi) [1] With the ignition "ON" and engine "OFF" (zero vacuum) Quote Link to comment Share on other sites More sharing options...
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