Hi, I'm new here so bear with me if I make mistakes. I'm looking for info on gas filler neck hose routing on a 2005 Chevy Silverado 2500HD. There are three hoses attached to the filler : Large one is for the gasoline input, another for vent which is smaller and yet another even smaller hose that I have no idea what its purpose is. Well the other end of that smallest hose came disconnected from somewhere and I can't locate where. It leads back to the rear of the truck. I can see where it had been rubbing against some brake line tubing. It is a regular vacuum line type hose and doesn't have any type of connector on it. If anyone here can help me out with this it would be greatly appreciated!