When my auto door locks were not working I went right to the vacuum pump under the rear seat. Well- the PO had completely removed it !

So I get another pump and it starts working right away and seems to turn on and off when it should. Two things:
1) what is the extra vac tube in the picture. I have no idea where it goes or connects to?
2) the drivers door works great (locks/unlocks ALL doors). The passenger and tailgate locks won't power the pump or open the other locks (they should). Any ideas??

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1987 300TD 147,000 miles- Palomino leather interior, 1995 facelift and body cladding, E350 wheels, Rebuilt suspension and sport springs, rebuilt turbo, New Monarch injection pump and injectors....and the list goes on and on...