Question about 1999 GMC Jimmy

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Not starting the truck will turn over but it seems like the engine is not getting fuel what could be the problem?

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  • Richard Scordino May 11, 2010

    Spray some carb cleaner into intake while cranking. If engine starts, then there is no fuel. (need to find out if filter,pump or power problem)


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A couple of things to check, when the engine is turning over, do you have spark? You can disconnect one of the spark plug wires, insert a screw driver in the end of the wire, hold the screwdriver 1/4" away from the block, crank the engine over and see if you have spark.
If you do have spark, borrow or purchase a fuel pump pressure gauge ($40 to $50), connect it to the fuel injector rail test port (looks like a tire valve stem with a cap on it) crank the engine over and record the fuel pressure. You should have 55 to 60 PSI. Make sure it does not leak down more than 5 PSI after you stop cranking the engine.
Good luck, let me know.

Posted on May 12, 2009

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