Question about 2002 GMC Sierra
You have a bad oil pressure switch. I know that sounds strange but It feeds the fuel pump. Some times randomly the PCM does a self check and shuts off the fuel pump relay when it does this it runs off power from the oil pressure switch. The easiest way to confirm this as a diagnosis is to unplug the fuel pump relay when the engine is running. If it dies when you unplug it thats it. if not you will probably need a fuel pump or possibly just a cap and rotor (tune) but I belive it is the oil pressure switch.
Posted on Nov 14, 2009
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Posted on Jan 02, 2017
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