Question about 1996 GMC Yukon

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I have a 1996 yukon 4 door it wont start thought it was the pump becuase i didn't here it dropped the tank and checked it by running wires to it and it works checked the wires and there is no power spayed starter fluild in throttlebody and it'll run any body know what it mite be

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  • cheap repair Oct 03, 2010

    have you checked your crank position and cam position sensors?

  • my_daddys_ga Oct 03, 2010

    i checked all fuses and relays and they are all good thats why i pulled the pump and i thought i'd check it anyway and it was good

  • my_daddys_ga Oct 03, 2010

    if it was the crank or cam sensors it wouldn't start by spaying starter fluid it would it

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There is a fuel pump relay under the hood - start there. there are some tests you can do to see if the relay is bad. One way is to jumper a wire from the positive side of the battery to the wire that goes to the pump from the relay socket and see if the pump runs. Then with a volt meter, you can check if there is voltage on the input side of the relay as well as the relay coil, and if there is a ground on the relay coil side when cranking the engine- this is the side that the computer uses to control the pump, by completing the ground. Then check all your fuses. More than likely it's your fuel pump relay. $8-$25 at your parts store.

Posted on Oct 03, 2010

  • my_daddys_ga Oct 03, 2010

    i checked all fuses and relays and they are all good thats why i pulled the pump and i thought i'd check it anyway and it was good and if it was the crank or cam sensors it wouldn't start by spaying starter fluid it would it

  • R M
    R M Oct 03, 2010

    If you checked the relay then its a simple fix - find the break in the wires feeding from the relay to the fuel pump! because - if you did check them like I suggested, then thats where the issue is. If not, go back and check again - one thing at a time the way I suggested. You will find the problem. I apologize for pczaps comment - it was NOT helpful, nor kind, nor cooperative. I do not know who this guy is. Take Care.

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You did that the hard way
If you had a wiring diagram,you could have started anywhere in the fuel system,checking as you went,until you had no voltage drop.
You could also have found a place, to put power to the pump, without removing the tank
There is a fuse,relay in most cases,fuel pressure regulator,etc in all vehicles. Have to know where and what to test.
Your working blind with no print of a system, your not knowlegable of.

Posted on Oct 03, 2010

  • R M
    R M Oct 03, 2010

    pczap made one good point - you should have a wiring schematic at minimum and diagnostic flow charts to aid you in finding the problem, and how to fix it - working on anything blind can cause worse problems. But, then, thats what shops are for, right? you can go to alldatadiy.com and buy a 1 year subscription to your vehicles Factory service manual, including up to date TSB (Technical Service Bulletins) of vehicle specific issues. The fee is $15 I believe. Mitchell1 has a service like that too, much more expensive though (Ondemand5). Good luck.

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I have a 98 gmc Yukon and I hooked a battery charger reverse and now its not starting the chow pumps not getting power I checked and changed the fuses and relays I also checked to see if the relay was getting power and it is any ideas

Posted on Mar 14, 2011

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