1968 Coronet RT, 440 basically stock. On this car the tank has 4 inlets/outlets not counting the filler neck. A supply, a return, and 2 vents. One vent goes into the trunk, up the side of the wheel well, and back out. The other one connects to the frame with the open end pointed down. What are the functions of the 2 vents? They obviously perform differently. I filled up with gas and when I got home there was some gas that leaked out under the car. When I checked it out the rubber tube attached to the outside vent had come off of the tank. I replaced it with a new piece, but I couldn't do a test drive because of rain and no wipers.