W203 c270 CDI replaced the engine on but it's not starting

[Joshuajoe]

Hy everyone I have a problem i replaced the engine on my MERCEDES w203 c270 cdi the engine i bought it wasn't have common rail sensors I replaced the sensors the car is only cranking not starting If I spray easy start seems like it's want to fire up and then die please any idea?

 

[mersum1es]

Are you getting fuel from aux pump when cranking? Enough fuel in tank (>1/2)? Is there air bubbles in clear return lines? Reason why donator lump was without rail sensor(s) (what actually was missing, sensor AND pressure valve)?