The 606 is notorious for being hard to prime after replacing all the fuel system components.

Double check you have a good o-ring at the pre filter (the little ‘coffee maker’ basket on top of the filter stand).

Go easy on the starter they can get burnt out from over use.

If air has gotten into the injector lines, you will have to loosen the nuts at the injectors to purge out the air. Otherwise the pressure pulses from the injector pump will just compress the air in the hard line like a sponge and won’t let the pintle valve open at the injector nozzle.

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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