You might have a problem with your fuel pump or its installation.
The fuel tank is basically two halves, well not quiet halves. When the fuel drops to a certain level the car starts to pump fuel from one side to the other so the pickup has enough fuel to run the car. That level is between half and quarter somewhere.
I do know that if the pump is improperly installed, when you get to that key point then the engine usually stalls because it runs of of fuel even though you have loads in the tank.
Could just be a problem with the sender as well, its easy to get to and check. Remove the boot carpet, and you'll see a metal plate to the rear on the right hand side. Remove the screws and the cover, and you'll see the fuel pump and the cap for the sender.
Have a read of my thread below where I had to take it apart to fix a seal, it has some links and several pictures on how to access the sender.
http://forum.a8parts.co.uk/showthread.php?t=4645
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Manny
2004 A4 1.8T Sport Cabriolet, 89K Miles
Past
2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly
with retrofit AMI and DVB-T in place of Analogue
2003 Volvo S60 D5 SE Manual, 197K miles.
2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles
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