Hand prime/pump to bleed air out of the fuel system as far as the injector pump. it should also show you if diesel is leaking past a hose connection etc. then you can start the thing and crack the injectors one by one to make sure they're bled up too.
i always suggest to fit an electric diesel lift pump to help the old girls out.

I guess also check the wiring to your fuel solenoid (lower side of injector pump) and make sure that is solid.