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REFUELING SHUT-OFF SYSTEM WITH FILL-LIMIT VENT VALVE

  • US 20070169842A1
  • Filed: 01/18/2007
  • Published: 07/26/2007
  • Est. Priority Date: 01/20/2006
  • Status: Active Grant
First Claim
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1. A refueling shut-off system for use with a fuel vapor recovery canister and a fuel tank formed to include an interior region for containing fuel vapor and liquid fuel, the system comprising a filler neck adapted to be coupled to fuel tank at a first end, the filler neck being formed to include an open mouth at an opposite second end and a fuel-conducting passageway extending between the first and second ends and communicating with an interior region of the fuel tank, a fuel vapor discharge conduit formed to include an outlet end adapted to mate with the fuel vapor recovery canister to discharge fuel vapor flowing in the fuel vapor discharge conduit into the fuel vapor recovery canister, a vent unit adapted to be coupled to the fuel tank and configured to receive and regulate flow of fuel vapor discharged from the interior region of the fuel tank to the fuel vapor discharge conduit for delivery to the fuel vapor recovery canister, the vent unit including a vent line formed to include an inlet and an outlet, a vent channel formed to include an outlet coupled to the fuel vapor discharge conduit to discharge any fuel vapor flowing in the vent channel into the fuel vapor discharge conduit, a normally closed flow-control valve formed to include an inlet port coupled to the outlet of the vent line and an outlet port coupled to an inlet end of the fuel vapor discharge conduit to allow fuel vapor discharged from the normally closed flow-control valve to flow into the fuel vapor discharge conduit and toward a fuel vapor recovery canister coupled to the outlet end of the fuel vapor discharge conduit, a normally opened fill-limit vent valve formed to include an inlet port adapted to be exposed to fuel vapor extant in the interior region of the fuel tank and an outlet port coupled to the inlet of the vent line to allow fuel vapor discharged from the normally opened fill-limit vent valve to reach the normally closed flow-control valve, and a normally opened first rollover valve formed to include an inlet port adapted to be exposed to fuel vapor extant in the interior region of the fuel tank and an outlet port coupled to an inlet formed in the vent channel to allow fuel vapor discharged from the normally opened first rollover valve to flow into the fuel vapor discharge conduit and toward a fuel vapor recovery canister coupled to the outlet end of the fuel vapor discharge outlet, and a fuel vapor recirculation conduit configured to interconnect the vent line and the fuel-conducting passageway formed in the filler neck in fluid communication, the fuel vapor recirculation conduit including a one-way liquid-fuel check valve configured to allow flow of fuel vapor discharged from the vent line through the fuel vapor recirculation conduit into the fuel-conducting passageway formed in the filler neck and to block flow of liquid fuel passing from the fuel-conducting passageway into the fuel vapor recirculation conduit into the vent line.

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