#6 not firing!

It wasnt a large hose it was the normal 3/32 or what ever it is. Also it was a braided rubbber hose, as if it were ment to handle fuel. Ill get a few pics this afternoon. Like I say the sticker says it is supposed to be there. I have been looking in my Haynes book to try to find some more info, but there are soooo many versions of the vacuum systems its hard to determine which or what combination I have. If it continues to run good, then the heck with it Ill leave it capped but I would still like to know what its ment for.