Adsorbent retention plate assembly for an evaporative emissions canister

An evaporative emissions canister comprising:

• a casing defining an internal volume;
• a retention plate partitioning the internal volume into an adsorbent chamber and a void space;
• an adsorbent that fills the adsorbent chamber;
• a cover closing an opening in the casing, the cover being adjacent the void space and having an inner surface that faces the void space and the retention plate;
• the retention plate having a first surface facing the cover and a second surface facing the adsorbent chamber;
• a resilient member between the retention plate and the cover and engaged with the first surface of the retention plate and the inner surface of the cover;
• a plurality of pins extending from the inner surface of the cover, each pin having a central body and at least one flange extending vertically along the length of the body, wherein the at least one flange has an outer surface that includes a terminal end that is distal from the inner surface of the cover, the terminal end including a stop;
• and
• a plurality of bosses extending from the first surface of the retention plate, the number of bosses equaling the number of pins such that each said boss complements one of the pins, each boss including a recess sized to receive one of the pins, each boss further including at least one cantilevered, inwardly curved, flexible finger that is engageable with the stop, each finger extending into the recess;
• the pins being aligned with and received in the bosses, wherein travel of the retention plate is guided by the pins, the pins and bosses cooperatively limit tilting of the retention plate, the stops of the pins limit an amount of travel of the retention plate away from the cover by contacting the fingers of the bosses, and urged engagement of the retention plate with the adsorbent in the adsorbent chamber maintains the packing of the adsorbent in the adsorbent chamber.