Stumped - non-starter, fuel pump issue?

[Poodle]

Having trouble with a mate's dt, have just tried swapping the pump to a bosch, failed, given up and gone back to the lucas. Now the car won't start and doesn't appear to be getting much fuel to the injectors, a dribble at best. The old lucas ran fine before, has been off for less than a day and was kept full of diesel in that time, so it's not a knackered pump issue.

So far he has tried:
Priming with the grenade
Priming with the grenade while cranking
Running on easystart
Bypassing fuel filter
Double-checked timing

Pretty out of ideas now and no closer to solving the problem, any suggestions would be very welcome, thanks.