fuel wont pump up

[hunter64]

ZD30motor carnt get fuel to the fuel filter have tried bleeding the system but just carnt get the pressure to go
hard . it all started when it wouldn't start pumped the filter then it started but it keeps loosing pressure
but now it wont start at all . I just cannot get the fuel there any help would be kindly appreciated .

[the evil twin]

If the vehicle was running and has starved of fuel (assuming it didn't run dry) then you will need to find the reason and fix that first.
Split line or whatever...

If it is a CRD they can be a real PIA, try filling the fuel filter manually, take off the filler cap, prime as much of the hose as you can and pump and pump and pump.
Don't, whatever you do, crack any lines or unions on the hi-pressure rail side...