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Hot Rods Sun fuel level gauge help

Discussion in 'The Hokey Ass Message Board' started by flathead_10, Jul 18, 2025 at 10:43 AM.

  1. flathead_10
    Joined: Jul 2, 2011
    Posts: 150

    flathead_10
    Member
    from Kansas

    I have a sun fuel level gauge that I would like to use, but I am coming up against an issue trying to find a sending unit. I measurs empty at 500 ohms and full at 2,000 ohm at 12v. The gauge also sweeps backwards, it rest at full and is powered to empty. Any help would be appreciated. 20250718_104044.jpg 20250718_104108.jpg
     
  2. Oneball
    Joined: Jul 30, 2023
    Posts: 1,486

    Oneball
    Member

    Are you sure you’ve got those readings right? Fuel senders are usually in the couple of hundred ohms range.
     
  3. flathead_10
    Joined: Jul 2, 2011
    Posts: 150

    flathead_10
    Member
    from Kansas

    Oneball, yes I am certain of the numbers. Thats what threw me for a loop.
     
    Oneball likes this.
  4. Oneball
    Joined: Jul 30, 2023
    Posts: 1,486

    Oneball
    Member

    BigRRR likes this.
  5. flathead_10
    Joined: Jul 2, 2011
    Posts: 150

    flathead_10
    Member
    from Kansas

    Hey man thanks, I didnt know about those. I will definitely study them.
     
  6. squirrel
    Joined: Sep 23, 2004
    Posts: 59,139

    squirrel
    Member

    Just so we can be certain of those numbers...how did you measure them? Please include all the steps.
     
  7. BJR
    Joined: Mar 11, 2005
    Posts: 10,996

    BJR
    Member

    Those numbers seem very wrong. Gauge Ohm range.jpg
     
  8. flathead_10
    Joined: Jul 2, 2011
    Posts: 150

    flathead_10
    Member
    from Kansas

    I used a potentiometer, rolled it in until it read on the e mark, measured the resistance and the same for the full side.
     
  9. squirrel
    Joined: Sep 23, 2004
    Posts: 59,139

    squirrel
    Member

    Did you double check using resistors, one for each end of travel? And you're sure you have the correct connections on the gauge?

    because those are strange numbers for a fuel sender
     
  10. flathead_10
    Joined: Jul 2, 2011
    Posts: 150

    flathead_10
    Member
    from Kansas

    I am 100% positive of the numbers. They are completely odd, I know. I cant find any information about these sun fuel gauges, they dont seem very common.
     
  11. BJR
    Joined: Mar 11, 2005
    Posts: 10,996

    BJR
    Member

    From the internet.
    A standard Sun fuel gauge sender typically has a resistance range of 240 ohms empty to 33 ohms full. This means that as the fuel level in the tank decreases, the resistance measured by the sender increases, and as the fuel level increases, the resistance decreases.
     
  12. squirrel
    Joined: Sep 23, 2004
    Posts: 59,139

    squirrel
    Member

    Might just need to find another gauge to use?
     
  13. That's what I remember, same range as Stewart Warner.
     
    bschwoeble likes this.
  14. flathead_10
    Joined: Jul 2, 2011
    Posts: 150

    flathead_10
    Member
    from Kansas

    I have to.
    I will pull it apart and see if there a component that us obviously bad.
     

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