The cigar hose is the return line, next to where it hooks to the hard line is the fuel delivery hose, that goes to the prefilter, to the primer, then to the spin on filter...

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So far...'76 240 D (sold)
'84 300SD (sold)
'85 300D (sold)
'83 300SD (p.o.s. waiting on tranny swap)
'82 300SD (could be the keeper)