Question about 1999 GMC Jimmy

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Won't start I have a 1999 GMC Jimmy, I just had the fuel pump changed recently and now its hard to start. The only way I can get it to start is if I let the ignition on the ON position for approximately 10 min. and then it will start, it will run all day if I don't shut it off. The minute I shut it off I have to do the same thing again, let the ignition on the ON position and start it. Someone told me it has to do with the security system, and that it could be bypassed but I don't know where to start to look, I don't wont to cut the wrong wire. Thank you Carl

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  • Cedrick White May 11, 2010

    What made you replace the fuel pump? Sounds to me like your fuel psi regulator is not working properly and causing the fuel to drain back in the tank after you shut it off. The next time you go to start it cycle the key on 3 or 4 times do not start it unil after the 3rd time and when you cycle it to the on position let it sit for 5seconds each time and see will it start

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There is a detailed write-up here: http://newrockies.com/vatsbypass. That guy is great, this was the only way I was able to save my Park Avenue.

Posted on Apr 16, 2010

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