CONTROLLING FUEL TANK VAPOR VENTING DURING REFUELING

摘要

A fuel tank vapor vent system for a motor vehicle having a float operat ed vent valve in the tank top for permitting fuel vapor flow through a vapor conduit to a remote storage canister. A filler nozzle seal in the tank filler neck seal s about the nozzle during refueling. A recirculation line is connected to the filler neck below the nozzle seal and also to the vapor conduit to the canister. Fuel fl ow in the filler neck during refueling effects recirculation of some-of the vapor flowing to the canister and minimizes the size of canister required.