Question about 1991 Chevrolet C/K 2500

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Starts cold but not when warm

1991 2500 5.7 350, starts fine in the morning. I can drive it someplace, park it, turn the key, and it won't restart. I have replaced the fuel pump and relay. The scenario is always the same. I can let sit for several hours and it will start right back up. I confirmed when the truck has problems starting, there appears to be no fuel coming out of the injectors. When it starts, the injectors seem to spray perfectly. Thoughts?

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  • harwood04
    harwood04 Feb 09, 2014

    Fuel pump does turn on, can hear it whiz when the key is turned. I just started it three times while cold. Let it warm up on third start, turned off, didn't start.

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  • Chevrolet Master
  • 5,278 Answers

Are you certain that the pump is on when the no start occurs? Do you hear it turn on with key on, not start, when the engine won't fire? It should turn on for 2 seconds to pressurize the line to the injectors. If you could, check fuel pressure when the no start occurs.

If it is the injectors, buy a cheap "noid light" to check the injector circuit. Buy the one that fits your injector harness connectors. You pull off a connector to one injector and put the noid light in the connector. When cranking the engine over the noid light should be blinking-that is the pulse that fires the injectors. The injectors have battery voltage to them any time the key is on. When the ecm momentarily grounds the injector circuit (internally in the ecm), the injector is pulsed. If the noid light does not blink or even light up when cranking, the injector circuit has a problem in the power side or the ground side.

Posted on Feb 09, 2014

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SOURCE: replacing fuel pump for 1996 chevy s-10 pickup

easier to drop tank...use lots of wd 40 on bolts , do that at least beginning the day before you begin work. make sure tank is fairly empty gasoline is pretty heavy and shifts around. While you have the tank removed look inside with a flashlight and make sure it's clean. If you did the filter with the tuneup likely you don't need another (unless you find lots of rust in tank) Don't forget. gasoline is flammable and fumes spread out over the ground. don't use electric lights drills or open flames anywhere nearby.
good luck hope that fixes it!!! sounds like you covered everything else!

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sounds real easy either a bad idle air control solenoid or more likley a blown throttle body gasket. to test fro a blown gasket, with engine running and cool spray carb cleaner or brake cleaner around base of tb were it bolts to intake. when it hits the bad area, should idle down and be normal for a second or 2. iac is possible,try this first since its so common and let me know

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SOURCE: 90 chevy k1500 350 tbi fuel problem starts but wont stay running

try bypassing the oil pressure switch on the back of the block behind the distributor, if there oil pressure switch goes bad it will do this. had one that drove me nuts trying to fix it then figured out I had to buy a book and low and behold thee it was 3 wire oil pressure switch you can't see between the engine and fire wall just behind the distributor and costs 8 bucks to buy new.

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i have a 98 chevy s10 zr2 and we changed the fuel pump and aint gettin no power to the fuel pump checked the fuses and relay under the hood no power and the gauges inside are not working other than lightin up.are there another fuse link some where

Posted on Feb 20, 2010

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