1974 C10 Dual Tanks, No Fuel Return Line?

[Cadillac Kid]

Hello Everyone.

I was hoping for a Suburban, but I got a 1974 c10 longed.
I'm just about to get the thing running after sitting for 10 years and I'm replacing the rubber fuel hoses. I am also replacing the fuel pump. While I was crawling under the truck I noticed only the Vapor return line, and the fuel feed line from the switching valve. Is there no fuel return line for dual tanks on these trucks? If It is there, where is it located? The previous owner may have disconnected it. This truck has factory A/C so I would assume it has a fuel return line somewhere.

Thank you for you help.

-Gavin