Question about 1996 GMC Sierra

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1996 gmc changed fuel pump still wont start,put gas in throttle body will start

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Possible ECU fault (engine management). CHECK fuel rail pressure and injector fault

Posted on Dec 14, 2014

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My 98 gmc safari starts but won't stay started unless u keep putting gas into the throtal thing behind the airvent I already changed the fuel filter still doing the same thing help


It might be your fuel pump not getting fuel to throttle body. Disconnect fuel line to throttle housing get someone to turn car over and see if fuel is getting pumped up. If not the pump could be faulty or fuel filter blocked. Also check to see if you car has a fuel cut of reset button it could just need a reset.

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Possibly a busted fuel pressure regulator diaphragm. The regulator is mounted to the end of the fuel rail.
With the engine idling, pull the vacuum line off the regulator port. If gas comes out of the port, replace the regulator.

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It sounds like the fuel pump. You may still be able to hear the pump, but it needs to produce a lot of pressure. If it is weak it won't do the job.

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