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Sending unit Ohm readings are all the same?

Discussion in 'The Garage' started by Redfrog, Mar 9, 2003.

  1. Redfrog

    Redfrog 1/2 ton status

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    Are the Ohm readings on ALL the sending unit's the same through out the years 73-87?? or do the differ by the tank size? Everything I have read would say that they are all
    90 ohms but I am not understanding how the all could be the same between different size of tanks.

    Or have I just read way to much in to this????
     
  2. ntaj*ep

    ntaj*ep 1/2 ton status

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    Thats the max reading. If you pull the sender out of the tank and use your OHM meter on the + & - while you move the float up and down your meter should show a varying amount of OHMs. Between 5 and 90 or so OHMs. Look for dead spots in the reostast as well. /forums/images/graemlins/thumb.gif
     
  3. HarryH3

    HarryH3 1 ton status Author

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    Yep, no matter how big a fuel tank is, half-full is half full. So 45 ohms means half a tank is left. The float arm changes between various tanks, but the rheostat is still a 90 ohm unit on GM's. /forums/images/graemlins/cool.gif
     
  4. Redfrog

    Redfrog 1/2 ton status

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    Thanks guy's it makes sense now. I guess the gauge is bad /forums/images/graemlins/frown.gif
     

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