| 摘要 |
<p>A vapor vent system for a fuel tank (32) having a vapor vent valve (34) in the top of the tank (32) with its outlet connected to a storage canister (54). In one embodiment the vent valve outlet is connected to the canister (54) through a hose (52,60) which is also connected to the filler tube for vapor recirculation. In another embodiment a conduit is connected at one end through the tank wall and the opposite end to the filler tube (40) for vapor recirculation. A nozzle seal (45) is provided in the filler tube (40) above the recirculation connection (60). The filler tube (40) is sized, below the recirculation connection (60), to effect a dynamic seal with a refueling nozzle (48) discharge to entrain vapor from the recirculation connection (60) and any air leaking past the nozzle seal (45) in the upper end of the filler tube (40) and to create a negative pressure when vapor recirculation is cut off to ensure activation of the automotic nozzle shutoff. A one-way valve (62) may be provided in the recirculation connection (60). <IMAGE></p> |
