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Fuel gauage on the fritz

Discussion in 'XJ Technical Chat' started by wonderdawg, Sep 27, 2010.

  1. wonderdawg

    wonderdawg Member

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    I checked and cleaned the electrical connections on the main wire harness. Checked and replaced for that matter the fuel sending unit. It was probably just fine, but I had already ordered the replacement part. Just not sure why the fuel gauge jumps all over the place like resistance values are change dramaticaly all by themselves. Any suggestions on how I might check the resistance value of the main wires going to the gauage from the sending unit. I know it should be green and black on my bike. I am just not sure what the resistance value might be for my bike.

    Regards,

    W. D.


    :? :? :?
     
    wonderdawg, Sep 27, 2010
    #1
  2. Robert

    Robert Active Member

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    A jumpy fuel needle sounds like an intermittent wire connection. Check that all of the fuel sender wires on the back of the instrument panel are tight and that your connector to the sender is properly secured, the contact pins on them do get loose with time.
     
    Robert, Sep 27, 2010
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  3. MN-Maxims

    MN-Maxims St. Paul Minnesota

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    Could be a bad solider joint up in the computer. But first I would trace the wires from the headlight back to the sender plug in. Did you just jump the sender out so the gauge goes to full and ride around to see what happens?

    MN
     
    MN-Maxims, Sep 27, 2010
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  4. Polock

    Polock Well-Known Member

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    i THINK it's 0 to 300 ohms
     
    Polock, Sep 27, 2010
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  5. wonderdawg

    wonderdawg Member

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    Thanks guys,

    I just have a couple more questions for each of you please.

    Presuming that the fuel acts as an Ohm meter what kind of voltages should I see on the gauge itself?

    Where might this fualty soldered wire connection be located at?

    What do you mean it could be problem on the computer?

    Regards,

    W. D.

    8) 8) 8)
     
    wonderdawg, Sep 27, 2010
    #5
  6. MN-Maxims

    MN-Maxims St. Paul Minnesota

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    The fuel does not act as an ohm meter.

    The fuel sender is a device that is a varaible resistor. The fuel level determines the amount of resistance to ground. If you have the tank off off the bike you'll see the sender bolted to the inside of the tank. The green wire is grounded on the sender itself. So really you are measuring resistance to ground at the sender.

    To quickly test the system out you can jump the green and black wire at the plug where the sender plugs in. The LCD display should show full. I would then take the bike for a ride and see if the display changes. Let us know what you find.

    The computer (system monitor) is located in the cluster just under the LCD display.

    MN
     
    MN-Maxims, Sep 27, 2010
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