Question about 2002 GMC Sierra

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I own a 2002 GMC Sierra 3/4 ton. I have cleaned the injectors, changed fuel filter, changed oil and filter, replaced tires, but she is still fluttering and then dyeing. The RPM's drop and it feels like I am not getting gas to where it needs to be. I pump the gas petal and sometimes it stops it from dyeing. What is wrong with my girl??

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  • mechanic144 May 11, 2010

    wow, it sound as if the fuel pump is at fault here..but just to make sure you will need to have it checked by a mechanic with a fuel pressure gauge..also, some GM trucks had issues with the fuel pump connectors coming off...sometimes causing a no start, or lack of fuel reaching the engine etc...have your mechanic check to see everything is plugged and that there are no burnt wires going to the harness for the fuel pump...then have them run a fuel pressure test..tell them the problem you are having...

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Hello,
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.

Roy

Posted on Nov 14, 2009

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