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fuel guage only moving between quarter mark before full and quarter mark before empty

Discussion in 'Automotive Electronics' started by Gobu, Sep 20, 2016.

  1. Gobu

    Gobu New Member

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    I have a Toyota harrier model MCU10 with the engine 1MZ-FE but my guage is only moving up to the quarter mark before full and quarter mark before empty. Why is that.
     
  2. crutschow

    crutschow Well-Known Member Most Helpful Member

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    Have you made any changes to the fuel tank or gas gauge?
     
  3. alec_t

    alec_t Well-Known Member Most Helpful Member

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    Damaged sender (rheostat)?
     
    • Informative Informative x 1
  4. dave

    Dave New Member

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  5. MikeMl

    MikeMl Well-Known Member Most Helpful Member

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    Senders are a float on an pivoting arm that moves a contact (bronze?) across a resistance to make a rheostat. The constant movement of the car causes the fuel to slosh, wearing out the contact or the resistance element.

    [​IMG]

    [​IMG]

    Looks like it is a common problem. Easy replacement, but sometimes requires removal of the fuel tank from the car.

    I had an old truck that required a fuel sender replacement. It was quicker to take a hole saw and make an access hole in the floor than it was to remove and re-install the entire fuel tank... If you remove the tank, replace all of the rubber hoses at the same time.
     
    Last edited: Sep 21, 2016
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