Adam, did you have anymore joy with trying a different fuel pump?
Sorry to hijack your post, but im having the same sort of issue.
To put evryone in the picture this is what happened.....
I was driving home Sunday night and I stopped at a petrol station. I filled up with petrol, then when I started the car my phone which was charging said 'danger high voltage', then moments later returned to normal. The car started fine. Nothing seemed wrong. I pulled out onto the main road, then 300m down the road the car cut out. I managed to roll into a layby where I tried to restart the car. It turned over then cut out. I could smell a faint smell like burning electrics. I managed to get picked up, then returned with a car trailer yesterday and got the car home.
Im running a fairly standard TT6 with no aftermarket ecu, boost controller etc.
Ive had a look around to see if there are any obvious signs, but nothing. There is voltage to the coil packs. Ive lookedat the ecu wiring and it all seems fine. The relays are clicking and all the fuses are how they should be. I too thought there maybe a problem with the fuel pump, but without checking the pressure I cant be 100% certain. I do have a spare bigger pump, but if you crank the engine over there did seem to be quite a lot of pressure from the old one.
Anyone else got any ideas? Is the crank sensor a common fault? Is it easy to change? Any help very much appreciated