Fuel Line Fittings Question

diymirage said
3 lines?
feed, vent and return?

did you add one yourself?

The 5/16” and 1/4” were original, and I welded in the 3/8” feed line and used the 5/16” as a return and plugged the 1/4”. This was on my sand drag jeep CJ7 with a built AMC 360