Question about 1999 GMC Sierra

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How to change the fuel level sensor on 1999 gmc sierra

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If I remember correctly, you must drop the tank to get to the fuel sending unit and float.

Posted on Oct 05, 2010

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Where is the fuel pressure sensor located on a 2002 GMC Sierra 1500 4X4?


The fuel tank pressure sensor on a 1999 GMC Sierra is located on the top of the fuel tank on the fuel pump itself. Most say that you need to drop the fuel tank to replace it but if you have access to a lift you can replace it without removing the fuel tank. By removing the rear U joint straps and moving the driveshaft to the side you can see and access the sensor for replacement. Chock wheels to prevent movement of the vehicle after driveshaft is disconnected.

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Where is fuel sensor 1997 2500 sierra truck


What engine do you have. Are you looking for the fuel level sensor or the fuel pressure sensor.

Apr 27, 2012 | 1997 GMC Sierra K2500

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My 1999 gmc sierra's fuel gage only works part of the time. the low fuel light comes on at start and stays on until it reads about 1/4 of a tank, then goes off. sometimes it works properly and registers...


The usual problem with these is the fuel level sensor.It is in the fuel tank.You can get the level sensor separate from the fuel pump.You don`t need to replace both.Hope this helps.Good luck.

Feb 25, 2010 | 1999 GMC Sierra

1 Answer

Replace fuel pump for 2002 gmc sierra 2500


First...this is where the pump is (gas tank) on the engines listed:

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Illustrating fuel pump and sending unit sensor (3) on 1999-2005 4.8L, 5.3L, 6.0L Engines


Removal & Installation
  1. Before servicing the vehicle, refer to the Precautions section.
  2. Remove or disconnect the following:
    • Negative battery cable
  3. Relieve the fuel system pressure.
  4. Drain the fuel tank.
  5. Remove or disconnect the following:
    • Fuel tank
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WARNING Do not handle the fuel sender assembly by the fuel pipes. The amount of leverage generated by handling the fuel pipes could damage the joints.

  • Fuel sender assembly retaining ring using a fuel tank sending unit wrench. Remove the fuel sender assembly and the seal. Discard the seal.
  • Note the position of the fuel strainer on the fuel sender. Support the fuel sender assembly with one hand and grasp the strainer with the other hand. Pull the strainer off the fuel sender. Discard the strainer after inspection. Inspect the strainer. Replace a contaminated strainer and clean the fuel tank.
    • Fuel pump electrical connector
    • Electrical connector retaining clip from the fuel level sensor
    • Sensor electrical connector from under the fuel sender cover
    • Fuel level sensor retaining clip
  • Squeeze the locking tangs and remove the fuel level sensor.
  • Remove the fuel pressure sensor.
  • To install:
    1. Install or connect the following:
      • Fuel pressure sensor
      • Fuel level sensor
      • Sensor retaining clip
      • Electrical connector to the fuel level sensor
      • Electrical connector retaining clip to the fuel level sensor
      • Fuel pump electrical connector
      NOTE Always install a new fuel strainer when replacing the fuel tank fuel pump module.

      • New fuel strainer in the same position as noted during disassembly. Push the strainer on the bottom of the fuel sender until the strainer is fully seated.
      • New seal on the fuel tank
      NOTE The fuel pump strainer must be in a horizontal position when the fuel sender is installed in the tank. When installing the fuel sender assembly, assure that the fuel pump strainer does not block full travel of the float arm.

      • Fuel sender assembly into the fuel tank
      • Fuel sender assembly retaining ring
      • Fuel tank. Install the fuel tank strap attaching bolts. Tighten the bolts to 30 ft. lbs. (40 Nm).
    2. Refill the fuel tank. Install the fuel filler cap. Connect the negative battery cable.
    3. Turn the ignition ON for 2 seconds.
    4. Turn the ignition OFF for 10 seconds.
    5. Turn the ignition ON.
    6. Inspect for fuel leaks

    Oct 25, 2009 | 2002 GMC Sierra 1500

    1 Answer

    Where is the oil level sensor located? oil guage wiggles between 40 & 60 at idle and stays on 60 on the road.


    That's not oil level you see on the gauge -- that is oil pressure in pounds per square inch (PSI). It is normal for the pressure to fluctuate when the engine RPM goes down. If it stays on 60 PSI on the road, you are very lucky -- that is excellent oil pressure!

    May 28, 2009 | 1999 GMC Sierra

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    1999 GMC Sierra fuel gauge is erratic


    the fuel level sensor inside your gas tank might be defective
    you need to drop the tank and check the level sensor

    Apr 02, 2009 | 1999 GMC Sierra

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    Loss of power


    The problem could be a plugged cat convertor, or fuel filter

    Dec 21, 2008 | 2003 GMC Sierra 1500

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