Not sure as far as the V6, I've got a 22R, mine has 2 canisters and the fuel lines run into the carb and then various vacuum lines (lots of them, about 25ft.) run out and around. A couple of the lines run to the canisters and I remember when I replaced the vacuum lines, the ones that ran to the canister had some gas in them. I believe that the canisters hold gas vapors so they aren't vented into the atmosphere, so this very well could be your problem....maybe one of the lines running into the canister is cracked or perhaps the canister itself is cracked, a visual inspection would probally be in order first!! I don't imagine those things being too cheap!

Good luck with it!!