Question about 1995 GMC Yukon

2 Answers

New fuel pump. ran great. now no fuel to throttle body. no sound at pump. new fueses. new fuse block. truck fires with prime.

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  • mark loving Jul 24, 2009

    I agree.
    The vehicle will just die as if it has a kill switch. The engine will run with a prime and produce oil pressure. the engine when it does start is great. I have had the engine die 8 times in 6 weeks for no obvious reason. restart is by prime..several primes at throttle body. three times by changing the pump.
    many restarts just by trying regular cranking over and over.
    The fuel is not getting to the throttle body.
    fuel cut off switch?
    ignition alarm switch?
    oil pressure switch?
    yikes!   Will a 12volt tester work on the fuel pig tail for testing or is that a 5 amp 

  • mark loving Jul 24, 2009

    what is the best replacement for the fuel pump????

  • mark loving Jul 24, 2009

    1995 yukon 5.7 gas.
    replaced 3 fuel pumps. still dies. no restart.
    what other solution or problem will prevent a fuel pump operation, and or cause fuel pump to stop?
    new pump, new fueses, new filter. good oil pressure.
    Engine does fire and run on a prime

  • mark loving Jul 24, 2009

    replaced fuses as a precausion.all fuses are good. suspect the electrical pig tail as i have heard of them being faulty.

  • mark loving Jul 24, 2009

    wow!!!!!!!
    Found something weird!
    checking the harness connection at pigtail on pump assembly to the plug in at frame 
    this plug , male an female with ground from pump and strap ground on pig tail gronding to frame.
    When i wiggle this i hear a tin can (tink)  I kept trying to hear the location and it sound like a tinking on  a pipe. I am guessing this is the pump making a sound as i wiggle the harness.
    The key is not on, yet it seams there is an electrical siyuation going on. after wiggling thi s few time and hearing the tink,,,,tink  the truck started just fine
    what do you think is going on?
    do i need to change the entire harness to the tank or just at the union with groung?

  • mark loving Jul 24, 2009

    The problem is located on the harness connecters at the frame beside the tank. The three way connecter with a sep ground wire connects to the female with built in strap ground.

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  • Master
  • 1,615 Answers

What you need to do is go to the connector for the fuel pump. Note when the key is cycled the power will be supplied to one of the wires for 3 seconds. For GM its usually the gray wire. You need to hook up a meter to see if you gets voltage. If you do, you have a defective replacement. Very commom.
Find the fuel pump relay in the underhood fuse block. Rotate it with the horn relay if you have no power. These trucks use oil pressure as a back up power source. If the fuel pump relay or fuse dies the car will continue to run but will not restart unless you crank it long enough to create oil pressure.

Posted on Jul 24, 2009

  • Ernset ( Skip ) Bouvette

    The best replacement is a dealer part. These trucks are real sensitive to fuel pressure. 54psi min it will start. 52psi and it will not. Also check the fuel regulator. Unplg the vacuum hose. If its wet then you need a new one.

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  • Master
  • 1,129 Answers

First check the fuse for the fuel pump if it is bad chances are there is either a short or the pumps pressure valve is faulty and the pump continues to run overheating and blowing out the fuse, fuses don't just blow for no reason if it is blow it is a symptom of a larger problem, you can try replacing the fuse but chances are it will blow again, forgive me if some of the information given appears redundant I prefer to give more information needed rather than less. You must unplug the fuel pump plug clean with electrical contact cleaner check with a voltmeter set on 10 amp DC to ensure after check and change fuse that there is 12 - 14 volts present on one of thewires probaly the red or green wire, make sure you ground the black probe of the voltmeter while using the red probe to check for power at the plug to fuel pump this will tell you if the pump is faulty, if the plug has power the pump you bought was a lemon and needs replacing again, it is also possible the ground is bad however unlikely. to check switch the volt meter to the symbol that looks like a bell or ohm symbol this will allow you to test for continuity on the plug which has groun wire. when you set the meter to this setting touch the two probe wires together it should go to 0 this means there is goo continuity through the circuit same principal in regards to checking the plug's ground, identify the two wires on the plug that are ground or have no power to them then touch the two probe wires to them to check to see if the reading goes to close to zero it should if not there is probably a bad groung somewhere back through the harness, this would be a unusual condition but it may be the problem. The pump should run for about 3 - 5 seconds when the ignition key is enegized so listen closely in a quiet environment. I hope this is helpful.

Posted on Jul 24, 2009

  • 1 more comment 
  • Mark Babineau Jul 24, 2009

    Locate check and or replace inertia fuel pump cut off switch.

  • Mark Babineau Jul 24, 2009

    Locate check and or replace the fuel pump cut off inertia switch. Component locator can be aquired on ebay motors in the form of a CD service manual or repair manual, or you can call the dealer to find out where it is located sometimes they have a reset button on them.

  • Mark Babineau Jul 24, 2009

    Try unpluging the pump and inspecting the plug's contact pins they may be dirty a lot of road salt and dirt gets kicked up ther an collects, purchase some electrical contact cleaner spray it out good wear safety glasses for obvious reasons then plug the plug back in remove plug back in repeat this should clean the contact in the pins apply some connector protector

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