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Thanks it has 29psi running and 31 when key is on, guess it needs a new fuel pump.Thanks it has 29psi running and 31 when key is on, guess it needs a new fuel pump.
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Fuel Shutoff Valve according to all the articles, however the switch operates the valve and the valve tells tales back to the ECM. You would need a pro grade scan tool computer to diagnose against known voltage values.
Pulling the fuel filter and checking to see if there's fuel isn't sufficient go to autozone and get a fuel pressure tester you must have at least. 1991 A body vehicles have a fuel pressure requirement of 40.5 to 47 PSI
check fuel pressure could have restricted fuel filter engine could be out of time.timing chain slipped time.but first try code scan look for fault codes.
Need to check to see if the fuel pump makes noise in the gas tank (humming when the key is cycled (aka priming the pump)) or check for fuel pressure at the rail with a fuel pressure gauge. Check if you have injector pulse when trying to start the car (purchase the correct noid light for your GM and see if it lights up when you try to start the car). Need to check for compression with a compression gauge - cheap and easy to do. Or check for spark with a spark tester - also cheap and easy to do.
could be a few thing , have it put on a real time scanner, not a code reader, blue streak makes a good one, have someone monitor the engine activators and sensors, also hook up a furl pressure guage to monitor
Thanks it has 29psi running and 31 when key is on, guess it needs a new fuel pump.
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