System Fault 131: Fuel Sensor?

[Granturadriver]

I have this fault message for some weeks! With the fuel tank filled up it I imagine it does not appear (so often), the less fuel the more often it is shown.



Any idea how to fix this issue? As there is no "fuel sensor", I can not just buy a new sensor.

What could it be? The fuel tank sender, the wiring, high pressure in the tank, the Carbon Canister? Any help is appreciated!

[Granturadriver]

It wasn't the earth connection, so it must be the sender in the tank.