The top pic in post 3 shows the right hand rubber line on the black can turning into black nylon and heading down the frame. This is a sign that it is a vapor line and the black can is a evap carbon can. In this case, the loose line would have to go to a purge valve then to engine vacuum.

The lower pic in post 3 shows the yellow hose attaching to a vacuum switch ( look for 2 wires on the bottom ) , not sure of what it does. In this pic there is a purple / yellow vac hose not attached.

Top pic in post 4 is for a turbo diesel, no help there.

Bottom pic in post 4, top right shows an elbow ( 104 ) attaching to what looks like a carbon can, however 2 lines are missing on the can and the other end of the hose ( 95 ) goes to a temperature actuated vacuum valve but nowhere past that.

Bottom right ( 71 ) looks to be a EGR valve ( NOx emission control )