This is probably a silly question, but the fuel gauge (on the dashboard) is constantly reading empty and the orange warning light is on.
I thought I'd have a look at the fuel gauge sender unit and check the wiring, in case there's a simple wiring fault or break somewhere, but the initial problem I ran into is that after lifting up the carpet in the back to find the access plate, the screws have rusted and the screwheads are worn.
Does anyone know the best way of undoing the screws without damaging anything?