Hoping someone can give me some directions on this problem. I have a 07 Town and Country. What is happening is occasionally I hear from under the car in the area forward of the fuel tank a groaning sound. The sound will sometimes be a low tone which goes up in tore or a single higher tone. Ya, I know this sounds really weird. I know there is a charcoal cannister in that area but am not sure if there is any kind of valve. If anyone has had a similar issue and know what this is, I would be very grateful. Thanks, Rick