Patent ID: 6948355

Claim:
A system of evaluating a leak detection test performed on a headspace of a fuel system supplying fuel to an internal combustion engine of a vehicle, the system comprising: a fuel vapor pressure management apparatus including: a housing defining an interior chamber; a pressure operable device separating the interior chamber into first and second portions, the pressure operable device including a poppet movable along an axis and a seal adapted to cooperatively engage the poppet, a first arrangement of the pressure operable device occurs during the leak detection test when there is a first negative pressure level in the first portion relative to the second portion and the seal is in a first deformed configuration, a second arrangement of the pressure operable device permits a first fluid flow from the second portion to the first portion when the seal is in a second deformed configuration, and a third arrangement of the pressure operable device permits a second fluid flow from the first portion to the second portion when the seal is in an undeformed configuration; and a sensor detecting the first arrangement of the pressure operable device during the leak detection test; and a processor that (1) calculates an in-use rate value by dividing a number of monitoring events by a number of driving events of the vehicle, the number of monitoring events being based on the sensor detecting the first arrangement; and (2) compares the in-use rate value to a standard value.