Need help identifying loose vacuum/fuel lines

[e5j]

I'm 70% done with a project K5. I bought the truck in very bad condition and many modifications had been made, some poorly done.

I have worked through most things. I currently have two unattached lines under the truck and I cannot find enough good data in my Haynes or Chilton books to determine what they are and where they are supposed to go.

One comes out of the top of the transfer case. I don't think it is a simple breather tube because it is not filtered or anything. The first attached picture is of the hose. Can someone tell me where it is supposed to connect?

The other is an unconnected steel tube that runs near the fuel line heading back to the tank. It ends, unconnected, just to the right (passenger side) of the transmission. (see 2d attached pic). I traced the tube back to the rear, behind th gas tank where it crosses along the frame cross member to the drivers side and ends at a strange three fitting connection to the rear of the gas tank filling neck. (see 3rd attached picture). I have no clue what the three fitting *device* is and have no clue what to connect the other end to.

Ideas? Thanks!!

--Jeff