Land Rover Defender new fuel pump problem

I know there is a defender thread on here but it is quiet and I hope to get more response here.If the mods want to move it to the defender thread that's fair enough.

On the first week of January I replaced the fuel pump on a 99 Td5 defender. I've been stuck on the side of the road three times since, the three occasions I had a half tank of fuel left or maybe a little less than half. There is no warning at all like spluttering or normal stuff you would associate with a fuel problem, power just dies and she will not start.
The week before last I had it towed off the motorway and let them bring it to their garage to see if they could find the problem.I picked it up few days later and was told that it was caused by oil wicking through the wiring loom into the ECU (a common Td5 problem).

About ten years ago, I replaced the injector loom because of this. I cant remember the exact symptoms at the time. But it never left me stranded.
This morning on the way to work, she stopped again on the motorway. Same thing a little less than half left in the fuel tank, and I got it towed to my house. I went and bought five liter's of diesel , bled the system, put some brake cleaner into the air filter and she started on the second attempt, drove it to a petrol station, filled it with diesel and she is running grand now.

I forgot to mention that they had pressure tested the system, in the garage last week and they said that it was perfect. Apart from it being very slightly harder on diesel than it was before with the old pump and that the diesel gauge is much more responsive, there is no other obvious difference apart from I cant rely on it anymore.
If anyone can think of what it might be that could be causing this issue please tell me. Thanks for reading such a long post.


O.A.P