Delivery valve seals is an "F" or "G" service item. Need to be replaced every 120,000 to 240,000 miles, depending on age and how much bioD goes through the pump. Heavy bioD use and you either need viton orings or replacement every year or so.

If is that DDD and DDDD service?  E service would be DD.

That sounds like me. Had to replace vacuum pump and timer, re-seal all the delivery valves, then found a complete suspension rebuild was needed, front and rear.
Max Dillon
Charleston SC
'87 300TD
'95 E300


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