I was on the freeway a couple days ago when the power fell out from under my foot. No juice at all. Once I pulled off, the engine would turn over but it would never achieve any RPMs, then it would die.
Got a call from my dealer today, who said it was a fuel pump failure. Said he hadn't seen anything like it, on the A3 MKII or otherwise. (Mine is at about 2100 miles--2.0T.)
Just thought I'd mention it in case anyone else has the problem.