Question about Chevrolet Tahoe

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Have a 1992 chevy tahoe, husband had the fuel pump replaced in the gas tank, it ran pretty good for 3 days, now it wont get gas into the throttle body. if he dumps fuel down the throttle body it will run for a few seconds then it dies again, we were told to check a emc box under the dash , how could that have anything to do why it isnt getting any gas? helpppppppppppppp please, to confused

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  • Jeff Turcotte
    Jeff Turcotte Sep 10, 2010

    sounds like an injector problem. Is the engine light on?

  • wuvyou_2 Sep 10, 2010

    no the engine light does not come on, I had it started three times today, while I was trying to figure things out and then tried again after about a hour and it wont start

  • Jeff Turcotte
    Jeff Turcotte Sep 10, 2010

    Engine light should be on--we need the trouble codes. Does the engine light come on when starting the car and then go out again? I will look up wiring diagram for the truck.

  • wuvyou_2 Sep 10, 2010

    the engine light comes on when I first start it along with all the other normal lights, but it goes off right away...that ecm box I was told to take out, I had hit that a few times, just cuz I was getting frustrated and that is when I got it to fire 3 different times but then like I said I went back out after about a hour and it wont start again

  • Jeff Turcotte
    Jeff Turcotte Sep 10, 2010

    Well, it could be that box that's the problem, but how much does it cost? There is one thing I will suggest to troubleshoot before you buy that box. I see there is a flarenut fuel connection to your throttle body. We usually use a line wrench to loosen these, but you may be able to loosen it with an open-end wrench. Just dont strip the nut. If you can loosen that nut and then turn on the key, the fuel pump should fill that line. Don't loosen it too much or you'll have a mess to clean up, but you do want to see some gas squirt out. If it will not squirt, loosen some more. If you get it all the way loose and still no squirt (I don't mean drips either), then there is a problem with fuel delivery.
    In that case, I would trace the line back all the way to the tank. I cannot tell if you have a pressure regulator or not. If you do, you can loosen the nut there and do the same test. Keep going back to each component in the line--especially the filter, and check to see a squirt. In this way, you will isolate the blockage.
    If you get a squirt at the throttle body right away, then the problem is the throttle body itself or the signal it's getting from the computer. If it was the computer, then I think you would have the engine light on. I would think it would also come on if the throtte body is bad, but maybe not.
    So it's your move now, as I don't know where to go without a little troubleshooting on your side.

  • wuvyou_2 Sep 10, 2010

    hey now that will save alot of money if that will help out..I will try that and see what happens...I hope it helps, because this is frustrating have a new fuel pump put on and still having the same problems as it did before the pump was put on, the job cost 200 bucks and it isnt any better..good thing I dont drink ..hahaha..thank you very much for your help and I will give that a try and see what happens and I will keep you posted thanks again

  • wuvyou_2 Sep 11, 2010

    ok I tried loosening the line going into the throttle body and there was no gas coming out, I loosened it all the way and nothing, what else would you suggest? I really appreciate any help thank you very much

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The line in between the pump that he replaced and the unit inside the tank probally has seperated or possibly the hose clamp was faulty or loosened up. i know its a lot of work to drop the tank but thats most likely the problem if not the fuel filter which is around 10.00 bucks and located on the inner frame rail.

Posted on Sep 28, 2010

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It may still be the fuel pump I have seen many aftermarket pumps fail within days, even hours. Check the fuel pressure it should be around 60 psi. if not its prob the pump but don't overlook the relay.

Posted on Sep 11, 2010

  • wuvyou_2 Sep 11, 2010

    ok I dont know how to check the pressure or the relay...my husband is working 7 days and I told him I would try and figure this out but I am having no luck..I guess it would help if I knew more about stuff on a car..but once I am told where things are I usually am pretty good at figuring them out,

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