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easy way to eliminate the pipework from the tank is use a small can with diesel and pipes straight to the filter.

With a diesel its pretty straight forward you have fuel you have compression you have air is all you need however on modern diesels there are a couple of other little gizmos to look at, not 100% sure on the D22 but the older nissans had a solenoid on the fuel pump that cut the fuel when you shut down if this is faulty it wont start, if the immobiliser is set to trigger or disable the same solenoid same result, it used to be the go to option to immobilise diesels a few years back, if you have electronic activated injectors then they can also disable the relay for that or if its faulty then thats another thing to look at.

Am really not too familier with the D22 but if they have a MAF in the air intake it may be dirty, one final thing the SCV may be faulty as well but honestly am not even 100% sure D22s have them.