Joe:

Hmmmm. Now you got me thinking. I'll have to ask my brother tomorrow when he gets home from T-day in Detroit where his were.

They may be in the recess where the fitting screws in, and it is possible that there is no o-ring on these particluar pumps. Did you get some from you supplier? If so, they belong there on the pressure valve holder up above the threads, although it is possible they go under the bottom end or sit in the sleeve instead.

The copper seal is for the high pressure part of the pump. The o-ring seals the low-pressure part. However, the early 300D pumps are different than the earlier and later pumps, so there may be a difference in o-rings, too.

Anybody else know about this?

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!