Patent ID: 8726947

Claim:
A fuel-filling system comprising a fuel-fill adapter, wherein the fuel-fill adapter couples to a manually-controlled fuel nozzle and to a filling port of a fuel reservoir thereby fluidically coupling the fuel nozzle to the fuel reservoir, wherein the fuel-fill adapter comprises: a fitting by which the fuel-fill adapter detachably couples directly to the filling port, wherein the fitting creates a fluid-tight seal; a first conduit for delivering fuel from the fuel nozzle, through the fuel-fill adaptor and into the fuel reservoir; a second conduit for venting vapor from the fuel reservoir and draining fuel overflow, wherein the second conduit is internal with respect to the fuel-fill adapter and passes through the fitting such that the vapor and fuel overflow passes directly from the filling port to the fuel-fill adapter; and a vacuum-breaking valve that receives air when the fuel filling system is under siphon conditions, and wherein the air flows direct the second conduit, and from the second conduit to the ambient environment to prevent fuel from being siphoned from the fuel reservoir into the second conduit.