Just finished putting the 200tdi in my 110 (19j) (The disco donor engine I drove was good before taking motor out), Hooked everything up, turned the motor over a few times before connecting fuel pump wire so the oil would circulate, hooked up the wire and it fired into life. I then noticed an injector pipe leaking so turned off the motor off to repair. I fixed repair then fired her up again, I let her idle for a few minutes, it then made a knocking noise i quickly turned the ignition off but it wouldn't shut down so I jumped in and stalled her, sounds like the engine wasn't pumping oil around, the low pressure oil light never came on,
There was no oil in the air filter to turbo,
I'm hoping it was a diesel knock from the engine, I am using the disco fuel filter, the top pipe going to Injector pump and the lower right pipe going to hand pump, I noticed I can't get pressure build up on the hand pump, I'm not over sure I've connected the fuel system up right, I'll have a look thru the forums to see if I can find a good picture of the set up, any help would be appreciated!!!!

oil pressure test safest way

to get the lift pump primer to work, rotate the engine 1/4 of a turn then try the lift pump primer again. The lift pump is driven off the cam.

False alarm! Put a new fuel filter on, did what you said to the lift pump, cracked the injectors and bled it, fired up an no knocking, just paranoia.... I hope? thanks