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Fuel Gauge/Sending Unit

Discussion in 'Early CJ5 and CJ6 Tech' started by Dble414, Sep 16, 2008.

  1. Sep 16, 2008
    Dble414

    Dble414 66-CJ5 Dauntless

    NH
    Joined:
    Sep 1, 2008
    Messages:
    13
    I thought my sending unit was no good so i bought a new and replaced it to find out that its still not working. I was wondering If there is suppose to a power wire connected to the battery because currently there is not one. There is a ground wire to the frame and a wire to the gauge. Am i missing anything? im not really sure. Ive read the other posts and have found nothing to help me.
     
    Dble414, Sep 16, 2008
    #1
  2. Sep 16, 2008
    jonnyspile

    jonnyspile Do you smell that???

    Southern Oregon
    Joined:
    Sep 16, 2008
    Messages:
    26
    My sending unit has no ground wire... only one wire to the gauge. I had the same problem with my unit when I bought it. Replaced the sending unit...no go. replaced the speedo assembly...no go. Turned out to be a loose wire connector at the sending unit...resoldered it and has worked fine since. Maybe that will help?
     
    jonnyspile, Sep 16, 2008
    #2
  3. Sep 16, 2008
    Dble414

    Dble414 66-CJ5 Dauntless

    NH
    Joined:
    Sep 1, 2008
    Messages:
    13
    Well the wire to the gauge just goes between a nut ontop of the sending unit. the only other thing i thought it could be the wire connection to the gauge. Ive tried to get it off from the gauge and what a pain that is, got so frustrated i had to stop and try every other possibility
     
    Dble414, Sep 16, 2008
    #3
  4. Sep 17, 2008
    scott milliner

    scott milliner Master Fabricator

    Seattle Wa.
    Joined:
    Dec 17, 2002
    Messages:
    2,362
    It could be a ground problem. You may need to ground the tank. Run a wire from the sending unit to the body.
     
    scott milliner, Sep 17, 2008
    #4
  5. Sep 17, 2008
    BUSMEC

    BUSMEC New Member

    Joined:
    Sep 15, 2008
    Messages:
    8
    Pull the wire off of the seding unit and grongd it to the body. the fuel gage should go all the way to full. If it does you know the wire and the gage are good. If it doesn.t the you know you have a problem with the gage or the wiring.
     
    BUSMEC, Sep 17, 2008
    #5
  6. Sep 17, 2008
    Fat Va. Boy

    Fat Va. Boy New Member

    Crimora, VA.
    Joined:
    Feb 18, 2007
    Messages:
    20
    I know a guy who put a brand new sending unit in his CJ5 and had problems with the gauge not registering. We dropped his tank and found the plastic float was full of gas. He fixed a spare brass float and reinstalled the sender and gauge instantly worked. Don't rule out faulty new parts.
     
    Fat Va. Boy, Sep 17, 2008
    #6
  7. Sep 17, 2008
    jonnyspile

    jonnyspile Do you smell that???

    Southern Oregon
    Joined:
    Sep 16, 2008
    Messages:
    26
    I agree. My brand new float had a hole in it also.
     
    jonnyspile, Sep 17, 2008
    #7
  8. Sep 17, 2008
    TexColorado

    TexColorado Member

    Reno, NV
    Joined:
    Sep 13, 2005
    Messages:
    167
    When does that ever happen? R)

    Yep, use the brass float.
     
    TexColorado, Sep 17, 2008
    #8
  9. Sep 17, 2008
    Wyo Eeyore

    Wyo Eeyore Member

    Eastern WY next...
    Joined:
    Feb 22, 2006
    Messages:
    75
    My gauge needle was swinging full to mt and inbetween. I ran a wire from the boddy to a screw in the edge of the tank. That cured the problem. I was a little unsure about drilling a hole for a sheet metal screw in the out side edge of the tank. It worked out well no more unsure gas gauge.
     
    Wyo Eeyore, Sep 17, 2008
    #9
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