Fuel gauge

Discussion in 'Mech Tech' started by Thomas Holloway, Jun 12, 2022.

  1. If it’s not one thing it’s another, sorted carb issue sweet !!! No my gauge has decided it won’t work when I turn the ignition it twitches ever so slightly but won’t engage or go up when I know I have half a tank in there, any suggestions ? Thanks guys


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  2. nell#2

    nell#2 Supporter

    Always the last place you had your hands
    Sender wire?
    Or earth (less likely)
    Did you have the tank out?
     
    snotty likes this.
  3. when mine went it was an earth behind the dash. I was gonna cut an access hatch in the decklid to get to the sender - i`ve bought the hatch just not had to use it thankfully!
     
  4. I’ll check the earth thank you


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  5. mikedjames

    mikedjames Supporter

    If its a pre 73 ish one then a disconnected sender wire can lead to it only twitching.
     
  6. It’s 73


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  7. mikedjames

    mikedjames Supporter

    If it can twitch its the earlier style. Later ones just drift around.
     
  8. They do not move at all, sir. Indeed, they can't.
     
  9. mikedjames

    mikedjames Supporter

    They twist slowly with the heat...
     
  10. Soggz

    Soggz Supporter

    Mine did that. And the number plate light has never worked… …

    until I changed the ignition switch…
     
  11. Surely not once they've warmed up. Mine's pretty slow to get there but then is steady.
     
  12. mikedjames

    mikedjames Supporter

    The heating of the hot wire and its expansion amplified by levers is a lot slower moving than the moving coil type magnetically operated mechanism of the older gauge.
    The hot wire reading is steady because the mechanism is really slow moving .

    The post 73 changes are definitely cost-down, not necessarily worse performing as the design is clever..
     
  13. So I took the pod out to take a look and with a wiggle of the gauge wire it would send the gauge to full, let
    Go and back to the bottom ? Is that an earth then ????


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  14. mikedjames

    mikedjames Supporter

    Is your tank full... otherwise you may have an open circuit sender and wiggling wires vigourously is causing a short.

    Disconnect the fuel gauge sender wire and measure its resistance to chassis. Should be between about 10 and 70 ohms. If its higher resistance you need to check the sender ..
     

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