P0462-Service engine soon light?

[Cutehumor]

Well, The service engine soon light came on last night, I had the code read today at autozone and got the P0462 code-"Fuel level sensor Circuit low iinput" can anyone tell me what this means? I thought it was loose gas cap, but light is still on. Autozone manager told me that I "overfilled the gas tank and caused the light to come on" but I haven't gotten gas in over 10 ten days and the light didn't come on until the tank is half full. the autozone manager said I would have to go to the dealer to erase and they couldn't do it. how can I erase the code without going to the dealer? can a loose gas cap cause this light to come on? can overfilling the gas tank make this sensor go off, if so does it need to be replaced?

2003 Nissan Sentra 1.8L 64k miles

 

[jsharp]

Pull the fuse for the ECU?

 

[MN Driver]

Disconnect the negative lead to your battery for a few seconds works with my most cars, but it resets the stored information for shift points, fuel trim, etc as well. Pulling the fuse works too but I never feel like searching for it, and I heard it's the PCM fuse for my car.

I have a hard time believing this "overfilled" crap. I've filled my tank until it was at the edge of the rim where the gas cap sits on plenty of occasions and haven't got a light for it.
I don't see how 'overfilling' a tank would cause your car to think that the fuel sensor is outputting a low voltage(out-of-range). Does the fuel gauge show a dead reading?