On several occasions now, I've noticed my fuel gauge playing around. I'll start the car up, and it will read half full, then when I turn the engine off and start again, it's at virtually empty, and the computer is telling me to fill up. It's happened too often now for it just to be a one off quirk. I've read one or two posts concerning dodgy eletrics, but I was wondering if anyone knew this was a common issue. I've got a 51 plate S3.