Question about 2002 GMC Yukon XL

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Shuts off while driving. no fuel pressure. pcm fuse blows/ fuel pump relay inserted.

Equipped truck with remote start/ custom security system. noticed about a month now that it sometimes wont crank on first two tries wether by remote start or by manually turning the key. had to jump start on couple times. recently while driving it completely shuts down. dash board lights up- traction on/off, security flashes, abs, low fuel, shift selection gone, parking brake and more. i ckecked fuse compartment left of steering wheel and found no blown fuse. i checked fuse box under hood and found ECM1 FUSE blown. i changed it and truck fires up fine. i drive home. next morning i had to jump start battery which fires up on first crank. truck drives for about 4 miles and shuts off. check for blown fuse, ECM1 is blown however this time upon changing the fuse and crankiing the vehicle the fuse just keep getting blown. i went through 5 fuse. my fuel pump will not prime when i turn the key to on. i took out the fuel pump relay, try cranking/ turning the key to on to prime fuel pump and this time the ECM1 fuse stays in tact. got new battery still no good.


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  • Anonymous Mar 13, 2009

    I was driving to go put gas....gas was low. As soon as I pulled into gas station truck shut off. I put gas and would not start again. The gages don't even mark for the fuel I put in or any of the other gages.

  • Anonymous Mar 14, 2014

    tried changing the crank sensor and found the ecm fuse blown. replaced fuse and still wont start

  • Anonymous Mar 17, 2014

    fuse is new and good

  • Anonymous Mar 20, 2014

    car wont start I have changed the ign switch ,changed the fuel pump need to find what the relays and fuse for

  • Anonymous Mar 24, 2014

    Were is the main fuse in fuse bos to truck we think its blown

  • Anonymous Mar 29, 2014

    Have changed every sensor including the bus fuse that runs the whole truck. Got it started went about three hudred feet and shut down . will turn over but will not start. The gas tank has pressure coming out of it making a loud noise and not wanting to take gas. When I turn on the key you can barely here the pump come on for just a second Please help me.

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  • GMC Master
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Sounds like the fuel pump is shorted.

Posted on Nov 03, 2008

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Fuel Pump The fuel delivery system uses either a high or low-pressure in-line or in-tank electric fuel pump, with some models equipped with both. It is a recirculating system that delivers fuel to a pressure regulating valve in the throttle body and returns excess fuel from the throttle body regulator back to the fuel tank. The electrical system uses two types of control relays, one controlled by a vacuum switch and the other controlled by the powertrain control module (PCM) to provide power to the fuel pump under various operating conditions.

An inertia switch is used as a safety device in the fuel system. The inertia switch is located in the cab, generally under the dashboard on the right side. It is designed to open the fuel pump power circuit in the event of a collision. The switch is reset by pushing each of 2 buttons on the switch simultaneously (some models use switches with only one reset button). The inertia switch should not be reset until the fuel system has been inspected for damage or leaks.
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When the ignition switch is turned ON, the fuel pump(s) will operate. If the ignition switch is not turned to the START position the PCM will shut the fuel pump(s) OFF after 1 second. The PCM will operate the fuel pump(s) operate the fuel pump(s) when the ignition switch is turn to START position to provide fuel while cranking.
After the engine starts, the PCM will continue to operate the fuel pump(s) unless the engine stops, drops below 120 rpm or the inertia switch is tripped.

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The first thing you should do is to locate the oil pressure switch/sending unit.

It's a single wire terminal with plastic connect sensor from the engine block.


This switch serves two functions.

1) provide oil pressure reading

2) disable the fuel pump relay in event of oil pressure loss.

===

When this switch is failing to provide the correct pressure to the ECU. The wiring harness can overheat and eventually create a short.

ECM1 fuse blow is because the harness is grounding/shorting.

===

DO NOT drive the truck until you change the oil pressure switch.

After you change the switch,you should spend sometime to inspect the wiring between the fuel pump relay,ECU and fuel pump.


Please post up day on the comment window/page.

I will follow up on it later.


Good luck.

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