Just to add some background info:
Mine was a combination of two isssues, namely fuel pump failure and then the subsequent problem of 'running out of fuel' when the gauge shows a quarter full. Once the fuel pump was replaced, and having effectively run out of petrol, the car showed signs of attempting to start on a couple of occasions and then pretty much nothing else. Strong cranking from the battery/starter motor. Low-loaded back to the garage to check (I was convinced there was fuel in there) and then discovered thanks to this forum about the fuel tank issue where part of the system to maintain equal levels on both sides of the fuel tank isn't working properly in my case. MJ seems to think it's one of the fuel return pipes possibly being blocked.
When my fuel pump borked, there were no prior warning signs apart from the car not moving lol, just a couple of spurts forward before the car stalled in the middle of a nicely-painted diagonal striped box junction.
Good luck with your investigations. It's probably worth updating your profile/signature to reflect where you are geographically, as someone on the forum may be able to assist with a quick VAGCOM or OBDEleven unit.
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2010 B8 S5 Sportback quattro 3.0 Supercharged in Sprint Blue (current girlfriend)
2000 D2 A8L quattro 4.2 in Audi silver (my ex-girlfriend)
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