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Gas gauge readings are controlled by the sending unit on the fuel pump. I do not believe there is a separate fuse for any particular gauge. In order to fix it, you have to remove the fuel pump from the gas tank, determine if the float is stuck or the sending contacts are out of alignment or dirty. Some can be repaired, but most are not serviceable. Remedy: replace the fuel pump and sending unit assembly. I would first inspect the wiring from the fuel pump connector(s) to make sure you have good connection and wire integrity.
Bad sending unit on the aftermarket pump, (take it back and put in a new one, have had that happen) or could be a bad wire connection, thourougly check your wiring first. (Most aftermarket pumps require you splice in a new electrical connector, check them out good first)
No issues with the fuel guage that I know of , but you can follow the basic troubleshooting guidelines. Starting with the wiring disconnect at the fuel tank for a bad connector or bad connection. Only other connection would be up to the instrument cluster in the vehicle. Only replaceable items would be the guage or the sending unit in the fuel tank. You can disconnect the return line circuit or connector at the at the gas tank and jump a wire to the ground the that feeds the gauge and see if the guage moves, but don't and i repeat don't hold to long because the guage will go over hard over and could damage the guage. If the guage moved and I would suspect a bad float on the sending unit or a bad sending unit, either case the fuel pump assy would have to come out for repairs.
Sounds like the float on the sending unit got stuck. This is a backyard tactic but... Try hitting the bottom of the gas tank with a hammer and see if it frees it up. Don't go and beat the hell out of it. A few decent whacks and it should come free. If not you'll need to have the fuel pump/sending unit replaced.
sending unit on the fuel pump in the tank is stuck, and needs to be replaced. its expensive, but that will fix your issue. its the housing around the pump that has the float arm on it. you can try to free the float arm by removing your pump assembly, but cant guarantee its any good after being stuck
Your fuel sending unit is bad. This is an electronic component inside of the gas tank. Many times the metal bar will rust and get stuck while there may be nothing wrong with the actual electronics, which is what it sounds like you have here. There is no cheap alternative to fix the problem correctly, however you can beat on the outside of the gas tank and it may free up the arm that is rusted.
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I can tell you almost for certain your fuel level sending unit is bad, I have been able to fix them though. It requires removing the gas tank and then the fuel pump. You can if your inclined, bend the brushes on the small circuit board over more so they will make better contact on to it. Other wise its a new fuel pump assembly, check all plugs and wiring by unpluging and repluging them to insure no bad connect. It is possible it could be the guage itself, but in thirty years of fixing cars never had a bad guage