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On most American made cars you can test the sending unit by removing the wire attached to the sending unit at the tank and ground or touch to the tank itself. If the needle on the gauge goes to full, the sending unit is registering properly. If it does not move it could also indicate the wire has been severed between the tank and the guage.

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Q: How do you test the fuel sending unit to see if it is bad or the dash gauge is bad?
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