Patent ID: 6874483

Claim:
A canister for an evaporated fuel processing system comprising a housing, defining a first absorbing chamber and a second absorbing chamber connected in series, said first adsorbing chamber being connected to a fuel tank and to an intake pipe of an internal combustion engine, said second adsorbing chamber is connected to an atmospheric port and comprises a perforated plate and a vapour absorbing layer between said perforated plate and said atmospheric port, said vapour absorbing layer providing a vapour flow path between the perforated plate and the atmospheric port and having a thickness indicative of said vapour flow path, said perforated plate comprising a vapour channel extending within said absorbing layer a distance less than or equal to the thickness of the absorbent layer and including a valve, such that when the valve is closed, vapour flow through the second absorbing chamber is through the vapour flow path between the perforated plate and the atmospheric port, and when the valve is open, a portion of the vapour flow is through the channel, thereby reducing vapour flow through the vapour flow path.