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Fuel Gauge/Sending Unit

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

  1. Dble414

    Dble414 66-CJ5 Dauntless

    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. jonnyspile

    jonnyspile Do you smell that???

    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. Dble414

    Dble414 66-CJ5 Dauntless

    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. scott milliner

    scott milliner Master Fabricator

    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. BUSMEC

    BUSMEC New Member

    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. Fat Va. Boy

    Fat Va. Boy New Member

    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. jonnyspile

    jonnyspile Do you smell that???

    I agree. My brand new float had a hole in it also.
     
    jonnyspile, Sep 17, 2008
    #7
  8. TexColorado

    TexColorado Member

    When does that ever happen? R)

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

    Wyo Eeyore Member

    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