Thank you for input. I meant to say (not my native language, sorry if it sounded as if I didn't take the issue seriously) that it simply runs,
even though it leaks that heavily.
I guess the air in the return hoses will end up back in the tank and bled somehow (and less catastrophic than air in feed lines?)?
I figure I will replace every single o-ring and plastic fuel line while at it, and doing the delivery valve seals too. The grocery list below got rather long...
I've never removed an intake manifold before, and also it kinda worries me that I will get so much air in the system the thing won't start afterwards, and the OM606 doesn't have a hand primer pump
AFAIK...
0049974540 6 Delivery Valve Washer
00760302113 2 Banjo bolt seal ring
0179974148 6 Diesel delivery valve seal
6010705332 1 Fuel line - fuel filter to IP
6010780486 7 Nozzle holder
6010782641 7 Fuel Line Bracket
6010900352 1 Main screw-on fuel filter
601092105 1 Pre filter
6019900863 1 Banjo bolt
6019970148 1 Pre filter seal ring
6030780141 7 Fuel Line Bracket
6049970045 2 Intake manifold seal ring
6050701432 1 Fuel line with fittings - fuel heater to prefilter
6060160081 6 rubber corner breather bung
6060160181 6 rubber straight breather bung
6060700032 1 Fuel line with fittings - feed pump to fuel filter
6060700232 1 Fuel line with fittings - prefilter to feed pump
6060700532 1 Fuel line with fittings - injection pump to fuel filter
6061410080 1 Intake manifold gasket
6069970645 2 Intake manifold seal ring - intake line to EGR valve/mixing chamber
617589010900 1 Special tool