Hey
Have you sorted this problem yet?
I have a PD115 AJM and sounds like the same issue, it happens when the car is left for a while, at first I was thinking its a cold start problem and I have been researching and eliminated alot of problems commonly said, glow plugs, cam sensor, etc. I have eliminated one big one, the engine and its sensors! :-) I had a run away train a little while ago, the engine seized up, so I swapped in another one, still had the same starting problem. So I now predict a fuelling problem. I changed my one way valve, located between the filter and tandem pump, the one swapped out was fine but it was a cheap try. No luck unfortunately!
I believe fuel is running back to the tank because I have to crank it for 3-5 seconds, then she starts, I can turn her off and straight away try to start and she starts fine! So... I think its the lift pump that is my issue.
I found this...
http://forums.tdiclub.com/showthread.php?t=208968And although im not going to try it, I do think this is my issue, as its the last thing I can try, going to find one down the scrap yard when I can.
Hope this helps!
I here it squirt when I turn the key to position one, but I cant get it to squirt a second time