Continuing fuel problems

[Quattrodave]

Afternoon all.

Firstly a big thanks to all that helped me identify where the fuel pump control module was located - the garage I had it at were properly perplexed!

So, they fitted it and all was well again, for about three weeks when the day following a successful 350 mile round trip to Plymouth the car cut out again in exactly the same way as before. I managed to get it recovered to the same garage who have had it a week now and have achieved nothing. Their diagnostics is telling them there is no problem at all, everything is running fine, they left it running for an hour, all good, then when reversing out of the garage it cut out on them!!

Beaten they've just sidelined my car and have been working on everyone elses so today I jumped back in my car (they left it on the road in a trading estate!) and drove home, no problems.

Does anyone have any ideas what could be causing this very intermittent problem whereby the engine will cut out and will turn over but won't start due to no fuel delivery for about an hour but will then start up and drive fine again?

It's had a brand new, audi sourced fuel pump control module less than a month ago which was showing as faulty when it did it before. The only other thing that has happened to the car is the front plenum chamber drain holes clogged up leading to a small leak into passenger footwell but as part of getting the fuel pump module replaced this was cleaned out thoroughly and nothing has leaked since.

Any clues or ideas most welcome. Kinda at the point where if this isn't sorted and put to bed soon I'm just going to get it fixed and sell the car