I have air in my gas tank and the gas gauge only reads full even when empty?

I have air in my gas tank and the gas gauge only reads full even when empty?
I hope you have air in the gas tank ... everyone does. The symptoms you describe may indicate a faulty gas cap. Heve it checked (tested) for functionality. Those sort of things wear out normally too, just like other things in your car.




a gas cap can not be this problem the gas gauge gets it reading from a float in the gas tank as it goes up so does the gauge. the higher the float the higher the gauge and the higher the voltage going to the gauge. the lower the float the voltage is lower so the gauge goes down. ether the gauge is stuck or the adjustable switch that is attached to the float is damaged. but it could be that a wire that always has 12volts is shorted to the signal wire going to the gauge because a signal wire the voltage changes and a power wire will always have 12volts. one example would be the wire that runs the fuel pump they are right next to each other