1979 300sd,, I have the black primer pump. In searching thru the pump threads, I have read that the old white pumps have to be unscrewed then pumped..
Do the black pumps have a screwed in ,stowed position?

Going to do a Diesel Purge and filter change tomorrow and this is something I was wondering about during my research.

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Second owner 1979 300SD 250K miles.
1995 Ford Lightning
66 Mustang
87 5.0 Mustang
08 Ford Edge
46 Willys Jeep
89 Transalp
97 Dodge Ram 2500 Cummins..