Question about 1999 GMC Yukon Denali

2 Answers

FUEL PUMP MAYBE

I BOUT A 99 DENALI IT PRETTY BUT THE FUEL PUMP IS GOING OUT? SO WE HAVE TO BEAT ON THE TANK TO CRANK IT AND THE I GOT ON THE INTERSTATE AND IT WOULDNT GO OVER 60 MILES PER HOUR IT WAS LIKE IT WASNT GETTING GAS WHAT DO I DO

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  • Jmac427 May 11, 2010

    definatly a fuel pump i had a suburban same thing happened careful the check engine light will not go off when it goes you wont have any warning would get it replace asap

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  • GMC Master
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Change the fuel filter first, it could just be a bad filter. Most of the time if the Fuel Pump go's bad the Engine will not run since there is not enough fuel pressure for the injectors to run.
A dirt fuel filter will still have fuel pressure but not the proper fuel rate. When you buy the Fuel filter at the parts store, like Auto Zone or Parts Source (they scan for free) if the truck can make it there, have it scanned for any DTC codes to see if there are any other problems that may be causing the problem like a bad Fuel pressure regulator or another sensors that may have gone bad making the truck do what it's doing.
The other thing to, Look for any corrosion at the Fuel Pump harness from the frame to the tank. See if there is any damage to the wire's and connection clips. But if your going to have to change the Fuel Pump, change the harness too. The extra $12.00 for the harness is cheaper then dropping the gas tank again just to change at 12 inch wire harness.
Good luck and hope this help. PS don't trash the old Fuel sending unit. You can always drill out the old Pump from the unit and replace it with a more reliable pump.

Posted on May 08, 2009

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  • GMC Master
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Yes, it does sound like your fuel pump may be going bad.
The first thing I would try is to change the fuel filter. If the fuel filter is plugged, it will cause a low fuel pressure and the engine will not run good.
After you change the fuel filter you will want to do a "fuel pressure" test. You can borrow a fuel pressure gauge or but one ( $40 US ) connect it to the fuel rail test port on the engine and start the truck. Your fuel pressure should be 45 to 55 lbs.
If you have more questions, let me know.
Regards,

Posted on May 08, 2009

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Fuel Pump
Removal & Installation
To Remove:


  1. Remove the fuel tank.
  2. Disconnect the fuel lines.
  3. Using the J 45722 or equivalent, remove the sending unit lock ring.






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  4. Remove the sending unit and seal.
  5. Discard the seal.
    CAUTION
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    into an approved container in order to reduce the risk of fire and personal
    injury. Never store the fuel in an open container.

  6. Clean sealing surfaces.

To Install:

CAUTION
In order to reduce the risk of fire and
personal injury that may result from a fuel leak, always replace the fuel sender
gasket when reinstalling the fuel sender assembly.


  1. Install a NEW seal.
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    full travel of the float arm.

  2. Install the sending unit into the fuel tank.
  3. Using J 45722 or equivalent, install the sending unit lock ring.
  4. Connect the fuel lines to the sending unit.
  5. Install the fuel tank.


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