fuel return line

diymirage said

but even then, all the sending units i saw, only list a 1/4 inch return, so there is always that restriction

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Nah, CHRYSTLER-DODGE-PLYMOUTH GAS TANK SENDING UNITS >>> Classic Car Auto Parts

It's the 11th one down in the list (Part # S-CR11238). 3/8 lines x 2. I put this one in my Dart Sport.

EDIT: *DO NOT throw away your original lock ring*