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I would not post my email address on a website for the public to see. The sending unit in the tank grounds the gauge with a resistor. The more gas in the tank the less resistance in the circuit. Someone would need to unplug the wiring harness at the tank and check the circuit with a meter.
Does it stick at about half full? I would fill up, the gauge would show full then after 60-70 mile when gauge should show less than half to a 1/4 tank the gauge still showed 1/2 tank so I'd go ahead and fill it up. Finally, I watched my mileage and when my yellow low on gas light came on I filled it half full. After a couple of weeks I filled it up and the gauge has worked every since.
The computer does a sweep test everytime it senses power. Check it next time you turn the key to run the gages do a little self test. However the fuse and gage won't be your problem. They are very bad for the fuel level sensor in the tank getting corrupted or dirty and doesn't read properly. You can try to add port fuel injector cleaner to the tank, but problem will usually reoccur. You will need the fuel tank dropped and the level sensor replaced.
It sounds to me like you have a short in your wiring harness at you fuel tank. there is a plug on top of your fuel tank that controls you fuel pump and your sending unit that tells you how much fuel is in the tank. This plug can be a real p.i.a to get to on some vehicles, you may have to take the vehicle to a shop to fix it, if you are not mechanically inclined.
It could be your fuel pump with your car not running right, the gas gauge thing i have no clue maybe the sensor inside the tank is messed up. or it could just be your fuel filter not doing its job. Htere are a few things it could be I would say Fuel Filter, Pump and maybe a vacume (spelling) problem, I would need to be there and hear it running or drive it to really figure out what it is