I just recently changed out my fuel injectors and also cleaned the air intake and the throttle body. During this process I have accidentally unplugged what seems to be a vacuum line. I can not find where it plugs into. It has a double barbed plastic connection piece that looks like it plugs right into a hose of the same size but yet I can't find it anywhere.
It is a 99' Audi A6 Quattro 2.8l
Here's some pics :

The skinny hose that runs alongside the larger coolant hose and under the coolant reservoir is the one that confuses me.

You can see here the barbed connector sticking out of the culprit hose.

This guy!
It appears it is coming out of the ABS Module pump? HELP!