Contaminant cover for tank filler neck closure assembly

A closure door system for a filler neck of a vehicle, the system comprising

• a closure apparatus formed to include a passage in the interior region thereof in communication with a nozzle-receiving opening therein, the closure apparatus being mounted on an open mouth of the filler neck,
• a first door coupled to the vehicle and movable between a closed position blocking access to the closure apparatus and an open position allowing access to the closure apparatus,
• a second door coupled to the closure apparatus and movable between a first position blocking access to the nozzle-receiving opening, a second position allowing access to the nozzle-receiving opening, and a transition position between the first and second positions,
• a third door mounted in the interior region of the closure apparatus and movable between a first position closing access to the interior passage and a second position allowing access to the interior passage, and
• an overcenter spring coupled to the closure apparatus and engaging the second door, the overcenter spring being configured to bias the second door toward the first position when the second door is positioned to lie on a first side of the transition position, and the overcenter spring being configured to bias the second door toward the second position when the second door is positioned to lie on a second side of the transition position.

A closure door system for a filler neck of a vehicle, the system comprising:

• a closure apparatus including a base mounted on an open mouth of the filler neck and an outer shell mounted on the base, the base having a passage in the interior region thereof in communication with a nozzle-receiving opening formed in the outer shell,
• a filler neck access door coupled to the vehicle and movable between a closed position blocking access to the nozzle receiving opening and an open position allowing access to the nozzle receiving opening,
• a spring for biasing the access door toward the closed position,
• a flapper door mounted in the interior region of the base and movable between a first position closing access to the interior passage and a second position allowing access to the interior passage, and
• a dust cover mounted on the access door for sealingly engaging the outer shell when the access door is closed, with the spring pressing the dust cover against the outer shell.

A closure door system for a filler neck of a vehicle, the system comprising:

• a closure apparatus formed to include a passage in the interior region thereof in communication with a nozzle-receiving opening formed therein, the closure apparatus being mounted on an open mouth of the filler neck,
• an access door mounted to a side wall of the vehicle and movable between a first closed position blocking access to the closure apparatus and a second open position allowing access to the closure apparatus through a filler neck access opening in the side wall,
• a spring for biasing the access door toward the closed position,
• a flapper door mounted in the interior region of the closure apparatus and movable between a first position closing access to the interior passage and a second position allowing access to the interior passage, and
• a gasket secured to the side wall around the filler neck access opening therein for sealingly engaging the access door when closed, with the spring continuously biasing the access door against the gasket when the access door is closed.

A closure door system for a filler neck of a vehicle, the system comprising

• a closure apparatus formed to include a pump nozzle-receiving opening, the closure apparatus being mounted on an open mouth of the filler neck, wherein the closure apparatus includes a front wall that defines the nozzle-receiving opening and a side wall that is appended to and surrounds the front wall, the side wall includes a radially inner section and a radially outer section that cooperates with the radially inner section to define a slot, and the spring lies in the slot,
• a first door coupled to the closure apparatus and movable between a first position covering the nozzle-receiving opening, a second position uncovering the nozzle-receiving opening, and a transition position lying between the first and second positions,
• a filler neck access door coupled to the vehicle and movable between a closed position blocking access to the filler neck and an open position allowing access to the filler neck, and
• a spring coupled to the closure apparatus and arranged to engage the first door, the spring being configured to bias the first door away from the access door when the first door is on a first side of the transition position and the spring being configured to bias the first door toward the access door when the first door is on a second side of the transition position.