[Engine] Starting a S/H engine

[Julian Scott]

I have a problem with a 2005/06 Berlingo 1.9 D 70. I have fitted a second hand engine after a major mechanical failure in the original engine (I suspect a bust con rod but have not stripped it yet). The S/H engine is visually identical and has compression, before installation I checked timing, fitted a new water pump cam belt etc. I also had to use the flywheel from the original engine as the S/H unit did not have one.  All the lights on the dash behave properly, the engine cranks but will not start.
There was a small leak from the manual priming pump, around the base of the plunger so I fitted the Filter/pump assembly from the original unit, it still did not start. I understand that the fuel system can be difficult to bleed so I rigged up a gravity feed to the distributer pump, still did not start, so while the engne was turning on the starter I undid the No.1 injector pipe at the injector a couple of flats, no fuel showing at all.
I now understand that the stop solenoid on the distributer pump is controlled by the immobiliser, could the problem be that as the pump on the S/H engine is different to that of the original unit the ECU does not recognise it?
I suppose i could swop the distributer pumps over and try it but the lack of access around the timing gear with the engine installed makes it a job I would rather avoid. Might it be possible to just swop the solenoid on top of the pump? Any thoughts on my problem  would be much appreciated.
JS