Td5 2003 - Runs and dies

Evening all...
Tearing whats left of my hair out over this one...
6 of Feb, driving along no probs, it cuts out... no amount of anything would start it. Recovered it back to the house.
Changed the starter out for a new Denso as last year I put in a cheap chinese one and she started first turn of the key, thought I was on to a winner... Little did I know...

She would sit on tick over fine... gets to about 2.5k / 3K and cuts out...
So far replaced:
Fuel pump
Fuel Filter
Injector harness...
Fuel pump relay.
When it dies the only way of straight away to restart is pull the pump relay...
Anyone any thoughts...

Cheers
David

Have you connected it to a code reader to see if any fault codes come up?
lt might be the best way forward, rather than changing parts blind.

Have you cleaned out the harness that plugs into the ECU? Might be full of oil that causing problems.