Can't do it.
Can't take the pump off to see inside.

More than one hex bolt is getting stripped....
I guess I'm just gonna have to keep some spare diaphragms and see how long they last.

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1991 300E 124.030 103.983KE 722358 03 412178
207K

1979 240D 123.123 250K (Project car)

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2015 Dodge Ram 1500 EcoDiesel 37K