I have a 99 GMC Sierra 1500. It was broken down and being worked on for some time. Charged the battery and it started right up. Moved it to the driveway and parked it to do a maintanence check and fluid check. When moving to the driveway it began spewing raw gas out of the exhaust pipe, and shaking a bit in the front end. Put fuel injector cleaner in the tank, charged the battery, the truck turned over once and was knocking horribly in the front end. Continued to run when I hit the accelerator. As soon as I let off it died, and won't turn over at all now. Turn the key over and it will click 1 time. I can't seem to pinpoint the issue at this time. While trying to crank, the starter will jump, and the belt on the alternator tries to pull over. Nothing. Ran fine when parked, ran to the driveway with no issue other than the small shimmy and the raw gas. Wondering if this is something small I'm missing or if it's something I don't want to dig into.

Asked by Pollardr11 May 07, 2018 at 04:24 PM about the 1999 GMC Sierra 1500 SLE 4WD Extended Cab LB

Question type: Maintenance & Repair

3 Answers

34,720

Raw gas out of the exhaust should of tipped you off there's a major problem. remove the spark plugs and see if you can turn the engine over by hand,don't crank it you may get a nice fire.See if fuel runs out of the cylinders.

Didn't find the raw gas until after I had it running. Someone mentioned it was the injectors. (Maybe one was stuck) Otherwise I would have stopped there. I'll try this tomorrow! Thank you!

I should say didnt catch the raw gas until it was running and parked in the current spot in the driveway.

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