Gead short in the wire from the gauge to the sender unit
the gauge works by the variable resistance in the tank unit so when the gauge is full there is low resistance so the gauge reads full
reading full all the time indicates that there is power flowing through the gauge to a ground before the sender unit in the tank
SOURCE: 1966 Ford Mustang Gas Guage not working
I had a similar problem. In my 1966 Mustang gas tank, the fuel pick-up was on a "float." My float developed a hole, filled with gasoline, and sank to the bottom of the tank, therefore, the gauge always read empty, but the car ran well. All the other gauges of course worked correctly. The repair was a relatively simple soldering job (after removing the float from the tank), but if that is indeed the problem, ensure all the gasoline is drained from the float before beginning the soldering job.
SOURCE: 1997 gmc safari gas guage stuck on full
if the gauge is still stuck when the van is off, try whacking the dashboard right above the gauge. PLEASE RATE MY ANSWER.
SOURCE: 1985 ford bronco 2 fuel gauge does not work.
I would change the fuel gages if not part of teh complete instrument cluster.
SOURCE: fuel gauge on 1993 Dodge Dakota V8
Definitely the gauge can be changed, provided the float in the fuel tank is OK, i.e. no leaks. This float connects to a potentiometer which records the current flowing thru it and displays it in the gauge. So before replacing the gauge measure the current and match that against the quantity of fuel in the tank...............sodeep
SOURCE: put in new float unit on fuel pump.gas gauge still not working
did you replaced just the float , because if the resistor that messures the level is not good you didn't do any thing you have to change the level sensor next to the pump..,Im sure that;s all the problem, you should also check the wiring next to the pumpand any connector down there
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