I'm in the middle of my 7500 mile service and I noticed that the lower fitting on the vaccuum valve didn't have a hose connected to it. It doesn't appear this hose is on the bike anymore. The best I could figure out from the manual was that this is supposed to be the "purge" line. Anyone know what's up with this? Do I need to run a new tube or is it fine as is? Where does the other end of the line belong?