You have purged the air from the steel lines, right?

You have to "crack the nuts" at the injectors and let the injection pump push the air bubbles out of the high pressure lines. Otherwise the trapped air acts like a spring and won't let the injector pop open to release the trapped air and fuel.

Once the engine starts to fire you have to go around like a mad man and tighten the nuts back down so be ready.

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech