Expansion Tank
Fuel tank vapor vent lines enter the bottom of the sealed expansion tank and are positioned vertically side by side within the tank. The upper end of each tube is open to allow discharge of fuel tank vapors into the tank. Expansion tank allows expansion of fuel as required during temperature changes and simultaneously becomes a liquid trap that allows only vapors to pass. A single vent line leads from the expansion tank to a limit fill valve at the engine firewall. The combined operation of expansion tank and limit fill valve prevents liquid fuel flow through the fuel tank vent line during downhill or uphill attitude of the vehicle.