Dodge Diesel/Cummins Mechanic Advice Needed

Brad4406 said

The injector lines were fully removed for installation of the injector pump. I don't know what the crossover tubes are. The lines I tightened down don't leak at the injectors; only 1, 3, and 4 leak as I left them loose as the bleeding procedure directed.

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They are responsible for getting the fuel from the injector lines to the injector. Your injection lines are actually sealing against these. The other end of them in an interference seal to the injector. They also have an o-ring on them that seals up the return fuel cavity. (this is what was causing issues for me)

this video shows them skip to 50 seconds. [ame="http://youtu.be/h26BTEboOKM"]LINK [/ame]