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Daughters old truck won't run unless I pour gas into it

1989 GMC 350 auto, air I have replaced fuel pump, fuel pump relay,ignition modual,both injectors, tempurature sensor, where can I find a wireing diagram or helpful tips or how-to I would really like to get this truck running

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Does the engine keep running once you start it with gas or starter fluid, or does it stumble for a bit and then die again?

It definitely sounds like there's no fuel getting through. Try disconnecting the fuel line with the engine off and routing it to a container, then try starting the car and see if any fuel is flowing.

If it is, there is likely a wiring problem to the injectors, which could indicate the injector fuse is blown. You could try jumpering the positive wire from the injectors directly to the battery and try to start the engine (obviously with the fuel line hooked back up!)- the negative is switched by the engine computer.

If there is no fuel flow at all, then check the fuel pump fuse. Again, you can try jumpering a wire from the battery to the positive fuel pump terminal and see if that starts the engine.

If there is very little fuel flow, it is likely a restriction in the lines or a defective pump. I would check the fuel filter, and perhaps blow out the fuel lines with compressed air. If that doesn't help, or if there isn't any restriction, then it comes down to a bad pump.

Posted on Feb 14, 2008

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