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How to test a sender (fuel / water / holding tank)

Not sure if it's the sender or the gauge that has stopped working?

To test the sender simply:

  • Disconnect the two wires on top of the sender.
  • Remove the sender from the tank.
  • Connect the wires on the sender to a multimeter. 
  • Set the multimeter to resistance [Ω ohms]

  • Move the float to the top of the sender and take a reading on the multimeter:
    • At the top of the sender (full) the resistance should be:
      • European specification - 190 ohms
      • American specification - 30 ohms

  • Move the float to the bottom of the sender and take a second reading:
    • At the bottom of the sender (empty) the resistance should be:
      • European specification - 0 ohms
      • American specification - 240 ohms