HELP!!!! please immobiliser won't allow fuel through!?

I have a peugeot 306, 1.9 TD. I have replaced the engine and done a rebuild cause problems with the original engine. Only now i can't get the car started, the engine ticks over but fuel is not allowed through the system! i have tried resetting the immobiliser with factory code, and few other things but nothing seems to work! Have been told that i need to find the original diesel pump, but i cant! is there any suggestion out there??? i am open to anything!!!!