Patent ID: 6913036

Claim:
A device for a fuel vapor pressure management apparatus of a fuel system supplying fuel to an internal combustion engine, the fuel vapor pressure management apparatus performing leak detection on a headspace of the fuel system, performing excess negative pressure relief of the headspace, and performing excess positive pressure relief of the headspace, the device comprising: a seal that is deformable between a substantially symmetrically deformed configuration, a generally asymmetrically deformed configuration, and an undeformed configuration, the seal is adapted to cooperatively engage a poppet such that: a first arrangement includes the seal in the substantially symmetrically deformed configuration and the poppet engaging the seal, the first arrangement being associated with the performing leak detection; a second arrangement includes the seal in the generally asymmetrically deformed configuration and the poppet engaging the seal, the second arrangement being associated with the performing excess negative pressure relief; and a third arrangement includes the seal in an undeformed configuration and the poppet being disengaged from the seal, the third arrangement being associated with the performing excess positive pressure relief.