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Fuel Sender Grounding Question

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  • Fuel Sender Grounding Question

    Hi gang,

    I just fired her up after her winter nap and I'm getting no reading at the fuel gauge.
    If I apply ground to the gauge I get a full reading.
    When I run a ground wire directly from the fuel sender to the gauge I get a full reading. (bypassing the harness altogether).

    My questions are:

    1. Am I getting a false reading by this method? Is this why the gauge pegs to full?

    2. Do I have a grounding problem?

    3. Do I have harness wiring issue?

    4. Is it time for a new fuel sending unit?

    Thanks!

    Rich

  • #2
    Should be able to test the sender, but you may have to pull it from the tank
    So much rust, so little time

    64 TR4 Overdrive Surrey
    68 TR250 Soon to have Overdrive & Surrey
    71 TR6 Hardtop Soon to have OD
    81 TR8 Injected Automatic...the LAST Automatic

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    • #3
      Pull the Green/Black wire from the sender and touch it to the metal top of the sender or you could also pull the black ground wire from the sender and touch the two wires together. If it still rises to full, that indicates you have a good ground at the sender, but the sender is not completing the circuit.
      R3
      Jim Herter,͏͏͏͏͏͏͏͏͏Copperas Cove, TX
      Original Owner ֍ 1970 TR6 CC 50990 LO

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      • #4
        What about engine temp gauge? Is it not working also? if both temp gauge and fuel gauge are not working, you probably have one of two problems. 1. The voltage stabilizer is bad. 2. The black ground wire that is attached to the back of the speedo is loose.
        1972 Sapphire TR6 #CC84,something

        1973 Harvest Yellow MGB V8

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        • #5


          The temperature gauge works fine. I'm going to try Jim's suggestion in a few minutes and get back to you.

          Thanks guys,

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          • #6
            "pull the black ground wire from the sender and touch the two wires together. If it still rises to full, that indicates you have a good ground at the sender, but the sender is not completing the circuit."

            When disconnecting both wires and touching then together the gauge rises. Thanks!

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            • #7
              Check to see if the sender's float is actually floating. if need be, Insert a hooked coat hanger into the tank and pull up the float arm and see if the gauge follows.

              R3
              Jim Herter,͏͏͏͏͏͏͏͏͏Copperas Cove, TX
              Original Owner ֍ 1970 TR6 CC 50990 LO

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              Fuel Sender Grounding Question

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