Problem with Nissan Xtrail Disel

I have in the workshop a 2002 Nissan Xtrail with Disel Yd22dti engine after overlapping it completely starts me once and then it costs to start unless I put a Starter. Accelerates perfect when it starts and walks perfect midway does not go out. An observation when I contact the valves SVC 1.2 are action and do not stop when putting the Scaner although the engine this marks me 57 rpm and CKP code already change this sensor and follow the problem.
Any comments would help a lot.

Look at the amount of fuel that comes out of the return of the injectors. It can be very return to the comanrail does not have enough pressure to inject the injectors and that is why by putting self -arran that you help you make more revolutions in low and so if it starts you