On the OM60x series engines, injector line cracking isn't necessary. It'll prime even if the entire system is aired up and the fuel filter isn't filled with fuel. Filling the fuel filter greatly speeds the bleeding process though. Foot to the floor during the cranking process helps greatly.

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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]