Question about 1992 Chevrolet K1500

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Help... I have a 92 350 chevy truck that will not start. I have replace the ECM, coil, ignition mod., the fuel pump relay and the fuel pump. When i turn th Ignition switch on th fuel pump doesnt come on. The fuse is good. I got 12v to th fuel pump relay but it doesnt come. If I spray starter fluid in th throttle body it sounds like it firing but if I spray gas it doesnt do anything. I cant get th fuel pump to come on if I jump th wires. Does anybody have any suggestions. Thanks

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You said you tried applying direct voltage to the pump? proceed to remove the fuel tank and check the harness inside for continuity, both wires going to the pump itself. If wires prove to be ok , then proceed to replace pump .

Posted on Apr 17, 2014

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Posted on Jan 02, 2017

mas66
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SOURCE: '88 chevy truck, no spray from injectors

Not sure on that model what controls the injector pulse, but most vehicles either use the signal from the crankshaft position sensor or a cam position sensor. You should use a LED testlight, (NOT A BULB TESTLIGHT!!) and backprobe the injector terminals (with the other lead of the testlight to ground) while cranking the engine over. If the light flashes on one of the terminals, then you are getting injector pulse, and the fault lies elsewhere. If not, then you will need to replace whatver sensor is used to provide engine position signal on that model. Also, check the wiring to that sensor. Some vehicles have problems with the crankshaft pulley harmonic balancer failing and damaging either the body of the crank position sensor or its wiring.

Posted on Nov 02, 2008

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SOURCE: 1987 chevy s10 2.5l tbi will not start. changed

That eliminates the crankshaft and camshaft position sensors. Have you checked the fuel injector itself for an open winding or stuck valve plunger? There should not be a steady 12 volts to the injector--if good injector, it would be spraying fuel steadily into the throttle body. But at least the engine should try to run if poorly. Take the injector out, dry it off with air, and intermittently apply 12 volts to one terminal while grounding the other. You should hear a click from inside every time you touch 12 volts. If not, replace it. If it does, it may be plugged with debris. Try blowing through it in reverse with compressed air.

Posted on Jul 17, 2009

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SOURCE: have replaced fuel pump, relay & fuel filter.

have you checked to see if you have a bad came or lifter. that would make it backfire. if it kind of spits fuel it maybe cam. if it throws fire than it could be timing like a bad chain.

Posted on Feb 12, 2010

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Help... I have a 92 350 chevy truck that will not start. I have replace the ECM, coil, ignition mod., the fuel pump relay and the fuel pump. When i turn th Ignition switch on th fuel pump doesnt come on....


You said you jumped the wires for the pump? Was that at the pump relay?
If you have a voltmeter or test light, keep the jumper wire in place and check for voltage at the fuel tank connector. The pump wire will be gray. With relay out and jumpered there, you should have battery voltage at the fuel tank connector. The key doesn't even have to be on, cause the relay has voltage to it at all times. If you jumpered it right (terminals 87 and 30 on the relay), and no voltage at the tank connector, you have a broken fuel wire somewhere between the relay and the fuel tank.
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