Question about 1995 GMC Sierra C1500

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93 gmc sierra 5.7 liter engine, injection carb, will turn over won't start, replaced fuel pump fuse, replaced fuel pump relay, replaced fuel pump inside gas tank, no gas flow to carb , gas gauge has always read improper gas levels, so i tend to run on empty alot, one week prior to trouble "check engine" light came on, but truck was running normal, no sluggestness in engine, all fluid levels were normal, everything was fine...thanx in advance "

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You say you replaced the fuse, but does the fuse have power? the gray wire at pump should have power when cranking, or for 2 seconds when turning key on. At fuel pump relay, put power onto gray wire, the pump should run if the wiring is good. if it doenst run then ck for power at fuse while power is on gray wire.

Posted on Oct 19, 2009

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