A1 Wiper Vacuum Lines ?

[aceecaus]

Where does the return line from the wiper motors on a M151A1 go? I have the line from the vacuum pump going up through the firewall, under the dash to the vacuum switch, then the lines going to the wiper motors, but where does the return line hook up to on the engine (or where)???
Thanks in advance.
Ace.

[Hambone]

I think the return line t's into the vent line that goes to air breather. I think someone told me if you leave the return line undone the wipers work better. you guys correct me if i'm wrong. Hambone