Fuel gauge not working properly

Pull the wire off fuel tank to the sender unit earth it out with ignition on.The fuel gauge should go to full slow even motion if it does replace unit in petrol tank.If it doest move you need new fuel gauge.Also before any of this i sumise you have checked fuse

If the trouble with the gauge started after you worked on it then you likely damaged or created a restriction to the movement of the sending unit. You will have to remove the tank and double-check your work.

Its very simple. If the gauge is showing half full then fill the tank and see how much fuel it takes. If the amount you add is approximately 50 percent of the fuel tank capacity then you know the fuel gauge is accurate . In that case the computer is giving an inaccurate reading and should be ignored. All you need is an accurate fuel gauge - it does not matter a row of beans what the computer says if the fuel gauge is reading correctly.

may be the float sensor going bad inside the tank

I have the same vehicle and my car actually was full of gas, registered empty & left me on the side of the road..It was the sensor in the fuel line that had to be replaced.

Bad fuel sending unit.

Its either a bad ground wire to the sending unit. The sending unit itself. The gauge itself.
If you ground the wire that connects to the sending unit in the tank the gauge should show full. Disconnected the gauge should show empty. this will test the gauge. Most often there is a ground wire going to the sending unit which corrodes.
Lee

you have 2 recalls
pcm update fuel pump replacement
fuel pump module replacement and pcm software

Remove the sender wire from the fuel tank and short it to ground (metal part of tank).

If the fuel gauge goes to full then your sender unit is faulty and replace it.If not ,please come back to me .

Please leave positive feedback if you feel I have helped you.

Thank you