I’ve found that rather than disassembling the d-jet pumps, let acetone sit for a bit while applying power and reversing polarity. It seems to work well IMO. Yes, the pumps do gum up, but they can be un-gummed.

__________________
Past mb: '73 450sl, '81 280slc stick, '71 250, '72 250c, '70 250c, '79 280sl, '73 450sl, parted: '75 240d stick, '69 280s, '73 450slc, '72 450sl,