Hi I have a 2000 W reg 2.5 diesel A6 which has suddenly decided to not start today. I filled up with Shell diesel, drove home 3 miles and this morning the car won't start. The AA chap came and whilst spraying his magic stuff up the air intake the engine started but as soon as he stopped spraying the engine stopped. His diagnosis is that the the fuel pump is faulty but there had been no previous signs of any sort of impending failure. The car always started, ran well and I had just driven along the M40 for 20 miles before filling up and going home. The only other symptom that may or may not be connected is a rattling relay under the dash on the drivers side. It started about 2 months ago and my Audi service centre couldn't (be bothered) to find it, nor my local Mr Fixit. Any one got any ideas? Could the relay be the fault thus stopping the pump from working? Many thanks.