If he's got fuel leaking out around the spin-on filter bolt, he needs to replace BOTH o-rings on the bolt. 84-85 had the bolt with two o-rings and you don't use the aluminum washer.

These symptoms don't surprise me for a new-to-him 617. Flushing out a fuel system (unless you go full tilt) won't always get 100% out. And what you don't get out probably was loosened by his actions. So it stands to reason that the new filters might get clogged up.

Check/replace the primary filter again and possibly the secondary (once you get the o-rings for the bolt). it took me about 3 filters to get everything cleaned out of my system.

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'95 E320 Wagon
'85 300TD "Puff The Magic Wagon" - SOLD
'19 Mazda CX-9 Signature - Wife's sled
'21 Morgan 3-Wheeler P101 Edition - SOLD
'95 E300d - SOLD
'84 300TD "Brown Betty" - Miss this one
'81 240D "China Baby" - Farm grocery getter