Question about 2007 GMC Yukon Denali

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Can hear fuel pump, and yukon acts like it will start but peters out almost immediately. Like no fuel?

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When you turn the key to the run position, you should be able to hear the fuel pump cycle. Fuel pressure should be 60-66 psi with the key on engine off, or about 56 psi at idle.

You need to get the codes read with a code reader. Any garage has these, they will charge you a diagnostic free (autozone) or you can buy your own for $80 at any auto parts shop. It could be one of many things, you need to know what the codes are.

Sounds like the truck needs some attention. Maybe cap, rotor, wires, air filter, fuel filter, plugs. Keep in mind that making noise does not meen the pump is pumping. Those are very picky about presure, less than 55 lbs and they wont run.

You did say it is pumping so it also could be electrical but I would check the pump presure first. When is the last time the fuel filter was changed. These will also cause a no start if they restrict the flow enough.

Ended up being a Crankshaft Position Sensor. Not saying that's it, but if its easy to get to maybe check it with a resistance tester, if it falls apart inside the coil could still be ok but re-positioned so it doesnt work. I got burnt by this once and it wont happen again. If it reads open however you can be fairly sure it is bad. Sometimes in the long run it is cheaper to find a good mechanic with a scope to see what signal is missing and let them fix it.

The Vortec 350's are excellent engines. Intake gaskets, injection system and fuel pumps are problematic in these trucks.

Good luck.

Posted on May 27, 2010

  • 4 more comments 
  • thomas dixon May 27, 2010

    this truck is actually a 2002 5.3L engine.
    I just drove it to new orleans yesterday from Houston, and ran like a top. Now this morning the aformentioned is happening.
    I'll go get a fuel filter and see what happens.

  • thomas dixon May 27, 2010

    don't you have to start the engine to do diagnosis?

  • ZJ Limited
    ZJ Limited May 27, 2010

    I don't think this is your problem, but communication errors (usually on the GMLAN lines) are common; usually results in service messages and warning lights. The BCM (Body Control Module) "could" cause that, but is not common, without some other sort of symptoms. A reprogramm would not help, there is no specific software calibration to address that. I suspect you are having a starter problem.

    I have seen a handfull of starters on this body style truck cause intermittant "no crank" issues. The starter is located on the passenger side of the engine and is accessible through the wheel opening (check this IMAGE). Then that may be the starter relay clicking
    (it is supposed to), which would mean one of two things: bad relay
    contacts (try swapping the Starter Relay with another relay that looks
    the same in the fuse box) or like mentioned before, a bad starter.

    you have a test light, for voltage on the
    purple wire at the starter while somebody cranks the car. If you do
    indeed have power on that wire while cranking, then the starter is
    confirmed bad.

  • thomas dixon May 27, 2010

    The engine cranks fine, it does not start.

  • ZJ Limited
    ZJ Limited May 27, 2010

    Isn't the battery, I suggest check the Shut-Off Fuel Pump Switch and the Theft System (page 132 and next), its possible that this is armed...

    Also, keep in mind the inspect of Ignition Switch. Next step, coils and ignition module.

  • thomas dixon May 27, 2010

    This is a 2002 Yukon XL.
    I changed out the fuel filter but no improvement. But thanks for your time, we will accept your answers, but looks like we will have to call a tow truck.



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