I have an audi avant 2.0 tdi automatic (trip tronic) 2005, I was driving along and I felt the car slow down temporarily (as if no fuel was getting in the engine) then noral and then slow down but nothing major, after 2 or so minutes I pulled up at a supermarket at parked on an ever so slight incline so front of my car was slightly higher than the back. After I did my shopping (about 10mins) I came out and the car would not start, the lights worked as normal, the engine did not turn over or mask any noise, when I held the key a bit longer ithe ignition I heard a clicking sound from the engine bay, but engine did not turn over. Breakdown guy tried to jump the car using his truck and still nothing. The next day I took it to a garage, they replaced the starter and still nothing. On the day that it broke down I did lift the hood and could smell a faint burning smell from the front of the car, passengers side headlight area (bear in mind I have a Lhd car) . A few days before I did run the car v close to being empty, and when I did fill up I only filled up with £20 worth of diesel. I mention this as I thought it could be a cause of the problem, as in build up of sludge, reading on the Internet I have read that I should check that fuel is going or getting to the engine , and aso check glow plugs ... Any advice would be apprected as garage are saying it coud be the engine but I can't understand why it didn't stop whist I was driving or that it didn't ake any odd noises before hand, any diagnostic help would be much appreciated as th last thing I need is the cost of replacing an engine.