Berry, I love reading your long posts. They are always full of common sense.
You are right, these lift/feed pumps are a simple design. When I got my rebuild kit
and saw what was in it, Iam thinking there has to be more to it than that.
And many of these pumps have lasted 300K miles or more w/o a rebuild.

Don`t know if it was the kit or the pump I used of a 617.95 engine, but it really made a difference in the 240D.
Don`t remember the exact mileage, but at least 375K miles or so on the 240.

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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works