Question about 1993 GMC Jimmy

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Jimmy won't start easy

My jimmy whiel fire up here and there new fuel filter new idler valve new map senser the fuel pump clicks doesn't hum pushed the valve on the fuel rail and it just shoots once and nothing else comes out and its all the way down

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  • carhob May 11, 2010

    seems youre saying fuel pump is not working

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Quit gessing and do a fuel pressure test sounds like fuel pump has went south.

Posted on Mar 02, 2009

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It sure could be. But, first...by "won't turn over" you do mean it cranks at normal speed but won't start?
A simple test of the fuel pump is to stand by tank and listen as someone turns key to on. When first turned to on, your pump will activate for 2 or 3 seconds, pressurizing the fuel system, and then shut off if the engine computer doesn't get a cranking signal. Do you hear it come on? If not, then something's not turning your pump on. If you can hear it buzz on briefly, then maybe it's your filter. Another test: Spray a little starting fluid into your intake manifold (remove the big hose going into intake manifold) while someone tries starting it.If it doesn't fire and try to stay running, then it's probably an ignition problem. But if it does fire off, then you know it's a fuel problem-likely your pump or filter. good luck.

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1 Answer

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