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Kristi kuzniak Posted on Mar 13, 2013

I have a 1990 gmc sierra and the gas gauge will only show a quarter tank when it is actually full. What needs replacing and is it difficult

  • Anonymous Mar 15, 2013

    Welcome

  • Anonymous Jun 08, 2013

    Might be a faulty resistor in your fuel gauge or bad wiring, might have to replace the gauge if it is not the fuel sender

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2 Answers

A

Anonymous

Have to drop fuel tank & replace the sending unit

I would not do that

It is too old for that trouble & expense

Just fill it once a week & keep track of mileage

Testimonial: "That makes sense! I'm just a little concerned because I go on a lot of road trips, but like you said, ill just have to keep track of the milage. Thank you!"

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  • Contributor 12 Answers
  • Posted on Jun 08, 2013
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Might be a faulty resistor in your fuel gauge or bad wiring, might have to replace the gauge if it is not the fuel sender

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5 Related Answers

Anonymous

  • 4669 Answers
  • Posted on Mar 08, 2009

SOURCE: 2002 Avalanche gas gauge problems

Gm has a real problem with fuel tank sending units. That is what is wrong. You need a fuel tank sending unit. You can only get them aftermarket with the whole fuel pump module, but you can buy them seperate if you buy it from the dealer.

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Anonymous

  • 594 Answers
  • Posted on Apr 16, 2009

SOURCE: gas gauge reading empty even when tank is full

Usually if the gas gage does not work yes it is true it may be the sensor if it is electronicly controlled. the sncor will more than likley be in the tank. here is how to remove your gas tank.

  1. Before servicing the vehicle, refer to the precautions section.
  2. Relieve fuel system pressure.
  3. Drain the fuel tank.
  4. Remove or disconnect the following:
    • Negative battery cable
    • Fuel filler and vent hoses
    • Fuel tank skid plate
    • Fuel tank wiring connectors
    • Fuel supply and return lines
    • Fuel tank
    • Fuel pump assembly
      7924bg17.gif Fuel pump assembly mounting
To install:
  1. Install or connect the following:
    • Fuel pump assembly
    • Fuel tank. Tighten the bolts to 27 ft. lbs. (36 Nm).
    • Fuel supply and return lines
    • Fuel tank wiring connectors
    • Fuel tank skid plate
    • Fuel filler and vent hoses
    • Negative battery cable
  2. Start the engine and check for leaks.

Anonymous

  • 1 Answer
  • Posted on May 04, 2009

SOURCE: 2002 honda crv fuel gauge moves really slow.

I had the same problem. My battery was going bad. When I replaced it with a new one, the fuel gauge worked fine.

emissionwiz

Marvin

  • 85242 Answers
  • Posted on Dec 02, 2009

SOURCE: Gas gauge is not reading correctly. Shows a full

the problem is caused by a defective gas gauge sending unit, this part is located inside the gas tank, you must remove the gas tank to replace it.

Randy Light

  • 84 Answers
  • Posted on Feb 12, 2010

SOURCE: Gas gauge in the dash malfunctioning - 1990 Nissan Hardbody truck

It sounds like the float on the sending unit is sinking. Don't know what the float is made of, but over time, it will soak up gas and start to get heavy. This would cause your problem. I don't think it's the gauge, but if you want to test it, disconnect the wires at the tank. The gauge will either go to full or empty. If you ground the sending wire, the gauge should respond the opposite way it was. good luck

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This condition is caused by a defective fuel guage sending unit, it is located in the fuel tank
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