<< Does anyone know where the tank line is that goes to the vapor canister? >> I believe the vapor can line comes up the left side frame rail, I mistook it at first for the FUEL line when working on my brake lines as it's steel underneath the car, then traced it forward to the firewall where it met a rubber line, then to the cannister. So you MIGHT have to crawl under the car to find the steel line, then look for a missing rubber hose to it, or broken off, etc. Or look down by the steering column to see if you can see a dangling hose or line way down. Hope that helps.... Jerry