Installed new Raptor petcock this morning (easy,peasy). After disconnecting the fuel line (split on one end so replaced with new) and disconnecting the vacuum line, I went to the other side of the bike to disconnect the vacuum line and found a loose line attached to the front of the carb, removed it and capped the vacuum tube. You can imagine my surprise when I went to install the new fuel line to find the end of the original vacuum line (the one I thought I had removed) was still there! It attaches to the rear of the carb. So, what line did I remove and where does it attach. Couldn't find this other line pictured in the manual. Help would be appreciated. Thanks  

in case you have a california carb...

california carb epa port to the left.
standard vacuum port to the right shown capped.