The gas gauge in my 1992 jeep Cherokee does not display how much gas is left. When the tank is over 1/2 full, it shows 1/4 of a tank. When it is under, it always shows 1/8 of a tank or empty. Sometimes it is different. I have tested the gauge by jumping the wires that go to the tank with resistors, and that shows that the gauge is fine and the problem lies in the tank. Is this possible to fix without replacing parts? I also can not find just the fuel float system on online parts stores.