Fuel gauge went out

Discussion in 'General Harley Davidson Topic' started by GimmeFuel, Sep 3, 2011.

  1. GimmeFuel

    GimmeFuel Member

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    Just as it reads above. So, is there anything I can do to fix this thing or do I just need to simply replace it?
     
  2. HDDon

    HDDon Experienced Member Contributor Retired Moderators

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    Are you sure it is the fuel guage and not the sending unit?
     
  3. Hoople

    Hoople Account Removed

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    As Don suggested, it may be the sending unit. There are a few wires going into the tank. The Black and Yellow/White go to the sending unit. Disconnect the connector at the tank. Measure the resistance between the Black and the Yellow/White using your meter.

    About 40 ohms is a Full Tank.
    About 120 ohms is a 1/2 Tank
    About 260 Ohms is an empty Tank.

    See what you read. All you said is the gauge went "Out". You did not say if your gauge is pegged on Empty or Full. But I think you get the idea of what you should read with your meter.
     
  4. GimmeFuel

    GimmeFuel Member

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    I'll check it out. It is pegged as though it were bone dry. One moment, it was working fine... the next, it wasn't working at all.

    So, if it is the sending unit, what then? Also, I'm not really sure where to disconnect what you describe.
     
  5. HDDon

    HDDon Experienced Member Contributor Retired Moderators

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    You might get lucky and it is just a wire that has come off or broken. Keep us posted.
     
  6. Iceman24

    Iceman24 Well-Known Member

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    GimmeFuel; the wires Hoople explains in his reply are located under your fuel gauge...just need to get it unmounted & test wiring w/meter. If one of the wires are broken/damaged - should see right away.
     
  7. Hoople

    Hoople Account Removed

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    I can only give you the needed tricks or "know how" on how to diagnose your problem.

    It doesn't take the place of having a Harley Service manual which lists the steps on how to replace the sending unit if it happens to be bad (reads Infinity with meter).
     
  8. Dr. Dolittle

    Dr. Dolittle Experienced Member Staff Member Moderator Contributor

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    Is there a separate fuse for the fuel gauge?
     
  9. Hoople

    Hoople Account Removed

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    Good point, it could be blown or open.

    "INSTR" fuse supplies power to gauge. But not a dedicated fuse & would affect other items.
     
  10. Breeze3at

    Breeze3at Well-Known Member

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    I'm not familiar with F.B. fuel gauge location, but my Dyna fuel gauge (where the left cap would be) wires come out of the bottom of the tank. Check the connection there.