My gas gauge reads past full all the time, the ground wire reads good. don't know what the sending unit is suppose to read when the tank is full and when empty in OHMS. What is the OHMS reading on a 20 gallon tank? I think the gauge is bad but want to make sure. if i know the tank reading then i will be able to press forward all wireing looks good from tank to gauge.
When the tank is full the resistance is low so the power through the gage make is read full
as the tank empties , the resistance increases so the less current means the gauge reads less until empty there is little or no power , the gauge reads empty
simple check , turn the ignition off, no power , no gauge reading
SOURCE: 1999 gmc jimmy fuel gauge reads empty, pulled fuel
look for a short in the sending wiring, empty means the circuit is closed, open circuit full
SOURCE: 1993 F150 front tank gauge reads empty, sending unit bad maybe?
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