I'll chime in with personal experience chasing air in fuel problems.
"off the rack" copper washers don't seal the same a as MB "sealing rings"
I had put all new copper washers in mine still to be troubled by air
Pulled all the original sealing rings off at a JY and replaced the copper and solved the air problem.
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Current fleet
2006 E320 CDI
1992 300D - 5speed manual swapped
former members
1984 300D "Blues Mobile"
1978 300CD "El Toro"
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