Sounds like a good analogy for how my stomach feels after a trip to Taco Bell...The vapor is supposed to vent down there and the charcoal is supposed to absorb the fuel vapor. On cold days with a very warm engine and a long ride where the fuel tank is very warm, when the bike is cooling down you can sometimes hear a gasping, sucking sound from the fuel cap. As the fuel vapor condenses back down to a liquid and the fuel cools down, it creates a vacuum and the fuel vent hole for sucking air in to equalize pressure can get a little blocked with some grime. Fun times.
I noticed it last night a faint beeping now and some chirping sounds from dash or under tank. It was so cool my car has never talked to me like that yeyeSo the bike makes a faint noise just sitting in the garage. Sounds like coming from under gas tank. It's been off for hours so I know it's not cooling down noise. It's making me wonder if it's possessed