I've had a old 67 Ford a 69 chevy van, a 70's caddy and a old 69 Buick all of which vapor locked on me at one time or another.
Not sure what all the lines are going to it now, It has the main fuel line and 2 other lines that go to the tank.
I'm sure the one that's about as big as my thumb is a vapor return line, but not sure what the other smaller line is??
Kurt