Question about 1999 GMC Jimmy
When you hook the pressure test guage to shrader valve on fuel rail what it reads is what the pressure is from pump, around 60 p.s.i. all you need to do is hook up the guage and turn on key, you do not have to turn engine over, and if pump is good it will shoot up to 58 or 60 right now.
Posted on Feb 14, 2009
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Posted on Jan 02, 2017
Hello and welcome to FixYa!
I would suspect a faulty ECM (engine control module). The ECM is like a car's brain that when it's faulty something will surely fail. I believe that you'll be good after the ECM replacement.
Hope this helps and thank you for using FixYa! Have a good one!
Posted on Sep 08, 2011
the fuel pressure if leaking could cause this the regulator is located under the intake plenum but you should smell gas .if you dont then most likely the pump is bad ,the pump will come on for 2 seconds when the key is on then go off it will not stay on with just the key on only when you crank it will it .so have your fuel pressure checked with a gauge.
Posted on Mar 22, 2009
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