Have your feed tubes been in service for some time?  Might there be a chance that the extended hot cranking you've been experiencing is due to leakage at the feed tube/injector interface? Then we highly recommend that the feed tubes be replaced whenever the injectors are removed from the head.  Incorrect alignment at assembly, and relative micro movement in service can cause leak paths between the injector and tube that leads to rail pressure loss.

 

This part can be used as a direct replacement for Bosch part numbers F 00R J01 572, F 00R C00 647, and F 00R J01 831, Cummins part number 4929864, 3979419, 4929865, 2872288, and 2872395, as well as Mopar part numbers 5086874AB, 5175565AA, 6800533AA, 68460261AA, and 68005335AA.