It would appear it is not the expansion tank or any of the associated piping, but it looks like it probably came from the fuel sender cap. When I bought my car the fuel gauge was very inaccurate, in fact I ran out of petrol while reading 1/4 tank (not even in the red) and from missing screws and the like it looks like someone had been looking at the sender.
I have fixed the gauge by use of the calibration figures VAG Com however the wake of the previous work would appear to be that the fuel sender cap was never done up properly and was not sealed. It just popped off with very little persuasion.
I have tried tightening it up but it seems virtually impossible without the correct tool, does anyone know a good source for the Audi 2012A fuel sender removal tool.
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