Patent ID: 7146970

Claim:
An evaporative fuel vapor control system comprising: a fuel supply having fuel that generates fuel vapor in the supply; an internal combustion engine being supplied with fuel from the fuel supply, the internal combustion engine having respective intake and exhaust manifolds; a vapor canister having a vapor passage disposed in fluid communication with the fuel supply to absorb fuel vapor from the fuel supply and having a vent passage disposed in selective fluid communication with one of the intake and exhaust manifolds to release fuel vapor to the engine; a vapor control valve disposed in the vent passage between the engine and the vapor canister; a sensor disposed in the bypass passage to provide a signal indicative of the magnitude of chemicals in the fuel vapor being provided to the engine; and wherein the vapor control valve includes a body housing comprising an inlet and an outlet that define the flow passage between the inlet and outlet, the inlet being coupled to the fuel vapor canister, and the outlet being coupled to one of the intake or exhaust manifold of the engine, and wherein the bypass passage comprises a bypass port to provide air essentially free of fuel vapor from the bypass port for dilution with fuel vapor in the vent passage, the bypass passage being in fluid communication with the inlet and outlet of the vapor control valve and so that the sensor is located in the bypass passage downstream of the bypass port in the flow of fuel vapor.