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problem is either with the cam position sensor (CPS) (get a hold of Steve
Young and get in on that GB if you haven't already) OR its the fuel pump. 
Both will cease to function without (much) warning. Both might die in the
heat and then come back when things are cool. The CPS will throw a 2113
code; there is no code for the fuel pump - it just dies.  I advocate
replacing the fuel pump every 100,000 miles as a precautionary measure. A
fuel pump replacement procedure that I wrote is at Charlie's website:

http://www.elektro.com/~audi/fuelpump/

Hope you solve the problem without too much pain.

Dave F.