I think you're right on the money about a fuel-line obstruction, I've replaced all the filters except the inline one. Suprise.... it's clogged! In fact it's black with scum. I'll replace it in the morning when Napa opens. Thanks.

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'84 190d 2.2 - Silver
Converted to 5-Speed
'84 190d 2.2 - Blue
Factory 5-Speed

'76 300D (W115)
Sold, found again in less auspicious circumstances