Fuel tank vent system

1. A fuel tank vent system comprising

a fuel vapor vent apparatus adapted to be coupled to a fuel tank to discharge fuel vapor located in the fuel tank to an external destination outside the fuel tank,

a vent controller including a controller housing coupled to the fuel vapor vent apparatus and a first valve positioned in the controller housing and adapted to control discharge of fuel vapor from the fuel tank through the fuel vapor vent apparatus to the external destination and block discharge of liquid fuel from the fuel tank through the fuel vapor vent apparatus to the external destination, and

means for blocking discharge of fuel vapor and liquid fuel from the fuel tank through the fuel vapor vent apparatus to the external destination in response to displacement of at least a portion of the controller housing relative to the fuel vapor vent apparatus due to application of a displacement force to the at least the portion of the controller housing upon deformation of the fuel tank caused by an impact against the fuel tank.

2. The fuel tank vent system of claim 1 , wherein the discharge-blocking means includes a second valve mounted for movement in the fuel vapor vent apparatus relative thereto between an opened position allowing discharge of fuel vapor from the fuel tank through the fuel vapor vent apparatus to the external destination when the controller housing is coupled to the fuel vapor vent apparatus and a closed position blocking discharge of fuel vapor and liquid fuel from the fuel tank through the fuel vapor vent apparatus to the external destination when the at least the portion of the controller housing is displaced relative to the fuel vapor vent apparatus.

3. The fuel tank vent system of claim 2 , wherein the discharge-blocking means includes valve opener means for moving the second valve from the closed position to the opened position in response to coupling of the controller housing to the fuel vapor vent apparatus.

4. The fuel tank vent system of claim 2 , wherein the discharge-blocking means includes valve closer means for moving the second valve from the opened position to the closed position in response to displacement of the at least the portion of the controller housing relative to the fuel vapor vent apparatus.

5. The fuel tank vent system of claim 2 , wherein the discharge-blocking means includes a shuttle and a spring, the shuttle and the spring are arranged to move along an axis in a chamber formed in the fuel vapor vent apparatus, the shuttle includes the second valve, an engagement sleeve, and a plurality of connector arms that connect the second valve and the engagement sleeve and cooperate with the second valve and the engagement sleeve to form a plurality of first apertures therebetween, the controller housing includes a head portion and a body portion containing the first valve which is adapted to control flow through a second aperture formed in a shoulder included in the body portion, and a frangible portion located between the head portion and the body portion and configured to break in response to displacement of the body portion relative to the head portion due to application of the displacement force to the body portion, and the engagement sleeve extends into the head portion to engage the shoulder to position the second valve in the opened position and to conduct fuel vapor from the second aperture to the first apertures when the controller housing is coupled to the fuel vapor vent apparatus.

6. The fuel tank vent system of claim 1 , wherein the vent controller includes frangible means for allowing a body portion included in the controller housing to separate from a head portion that is included in the controller housing and is coupled to the fuel vapor vent apparatus in response to displacement of the body portion relative to the fuel vapor vent apparatus due to application of the displacement force to the body portion.

7. The fuel tank vent system of claim 6 , wherein the frangible means is an annular V-shaped groove formed in the controller housing between the body portion and the head portion.

8. The fuel tank vent system of claim 7 , wherein the head portion includes a ring-receiving groove and an O-ring positioned in the ring-receiving groove and the V-shaped groove is positioned below the ring-receiving groove.

9. A fuel tank vent system comprising

a fuel vapor vent apparatus adapted to be coupled to a fuel tank to discharge fuel vapor located in the fuel tank to an external destination outside the fuel tank,

a first vent controller including a controller housing coupled to the fuel vapor vent apparatus and a first valve positioned in the controller housing and adapted to control discharge of fuel vapor from the fuel tank through the fuel vapor vent apparatus to the external destination and block discharge of liquid fuel from the fuel tank through the fuel vapor vent apparatus to the external destination, and

a second vent controller mounted for movement relative to the fuel vapor vent apparatus from an opened position allowing discharge of fuel vapor from the fuel tank through the fuel vapor vent apparatus to the external destination to a closed position blocking discharge of fuel vapor and liquid fuel from the fuel tank through the fuel vapor vent apparatus to the external destination in response to displacement of at least a portion of the controller housing relative to the fuel vapor vent apparatus.

10. The fuel tank vent system of claim 9 , wherein the fuel vapor vent apparatus includes a valve seat, the first vent controller includes a controller housing coupled to the fuel vapor vent apparatus and a first valve contained in the controller housing, the second vent controller includes a second valve and a spring arranged to move the second valve toward the valve seat to establish a sealed connection between the second valve and the valve seat in response to displacement of at least a portion of the controller housing relative to the fuel vapor vent apparatus.

11. The fuel tank vent system of claim 10 , wherein the fuel vapor vent apparatus includes a receiver receiving the second valve and the spring and a retainer retaining the second valve and the spring in the receiver, the retainer includes the valve seat and a seat mount coupled to the valve seat and the receiver, and the controller housing is arranged to extend into the seat mount to establish a sealed connection between the first vent controller and the seat mount.

12. The fuel tank vent system of claim 9 , wherein the second vent controller includes a valve arranged to move in the fuel vapor vent apparatus relative thereto between an opened position allowing discharge of fuel vapor from the fuel tank through the fuel vapor vent apparatus to the external destination when the first vent controller is coupled to the fuel vapor vent apparatus and a closed position blocking discharge of fuel vapor and liquid fuel from the fuel tank through the fuel vapor vent apparatus to the external destination when the at least the portion of the first vent controller is displaced from the fuel vapor vent apparatus.

13. The fuel tank vent system of claim 12 , wherein the second vent controller includes a valve opener arranged to engage the first vent controller to move the valve from the closed position to the opened position upon coupling of the first vent controller to the fuel vapor vent apparatus.

14. The fuel tank vent system of claim 12 , wherein the second vent controller includes a valve closer arranged to move the valve from the opened position to the closed position in response to displacement of the at least the portion of the first vent controller.

15. The fuel tank vent system of claim 12 , wherein the second vent controller includes shuttle and a valve closer, the shuttle includes the valve, a valve opener, and a follower, the valve closer is arranged to move the valve from the opened position to the closed position in response to displacement of the at least the portion of the first vent controller, the valve opener is arranged to engage the first vent controller to move the valve from the closed position to the opened position upon coupling of the first vent controller to the fuel vapor vent apparatus, and the follower is arranged to slide along an interior surface included in the fuel vapor vent apparatus to guide movement of the valve along a controller axis between the opened position and the closed position.

16. The fuel tank vent system of claim 15 , wherein the valve includes a disk and an O-ring coupled to the disk, the valve opener underlies the disk and includes an engagement sleeve arranged to engage the first vent controller and a plurality of connector arms connecting the disk and the engagement sleeve, the valve closer is a spring positioned above and engaging the disk, and the follower is a follower sleeve extending upwardly from the disk to surround the spring and engage the interior surface.

17. The fuel tank vent system of claim 9 , wherein the first vent controller includes a frangible portion configured to break in response to displacement of the at least the portion of the first vent controller relative to the fuel vapor vent apparatus.

18. The fuel tank vent system of claim 17 , wherein the frangible portion is an annular V-shaped groove.

19. The fuel tank vent system of claim 9 , wherein the first vent controller includes a controller housing coupled to the fuel vapor vent apparatus and a valve positioned in the controller housing and the second vent controller is arranged to move from the opened position to the closed position in response to the displacement of at least a portion of the controller housing relative to the fuel vapor vent apparatus upon deformation of the fuel tank caused by an impact against the fuel tank.

20. A fuel tank vent system comprising

a fuel vapor vent apparatus formed to include an outlet passageway and adapted to be coupled to a fuel tank to cover a tank aperture formed in the fuel tank to discharge fuel vapor located in the fuel tank through the tank aperture and the outlet passageway to an external destination outside the fuel tank,

a first vent controller including a controller housing coupled to the fuel vapor vent apparatus and a first valve adapted to control discharge of fuel vapor from the fuel tank through the tank aperture and the outlet passageway to the external destination and block discharge of liquid fuel from the fuel tank through the tank aperture and the outlet passageway to the external destination, and

a second vent controller positioned above the first vent controller in the outlet passageway, the second vent controller including a second valve, a valve opener, and a valve closer, the second valve being mounted for movement relative to the fuel vapor vent apparatus along a controller axis between an opened position allowing discharge of fuel vapor from the fuel tank through the tank aperture and the outlet passageway to the external destination when the controller housing is coupled to the fuel vapor vent apparatus and a closed position blocking discharge of fuel vapor and liquid fuel from the fuel tank through the tank aperture and the outlet passageway to the external destination, the valve opener being arranged to move the second valve from the closed position to the opened position upon coupling of the controller housing to the fuel vapor vent apparatus, the valve closer being arranged to move the second valve from the opened position to the closed position in response to displacement of at least a portion of the controller housing relative to the fuel vapor vent apparatus due to application of a displacement force to the at least the portion of the controller housing in a direction transverse to the controller axis.

21. The fuel tank vent system of claim 20 , wherein the fuel vapor vent apparatus includes a valve seat and the second valve includes a disk and an O-ring, the disk includes a peripheral portion formed to include an annular groove receiving the O-ring, and the O-ring is arranged to engage the valve seat when the second valve is positioned in the closed position and to disengage the valve seat when the second valve is positioned in the opened position.

22. The fuel tank vent system of claim 20 , wherein the controller housing includes an annular shoulder formed to include a controller aperture, the valve opener includes an engagement sleeve and a plurality of connector arms connecting the engagement sleeve and the second valve to define a plurality of opener apertures therebetween, and the engagement sleeve engages the shoulder to position the second valve in the opened position allowing discharge of fuel vapor from the fuel tank through the controller aperture, the engagement sleeve, and the opener apertures to the external destination when the controller housing is coupled to the fuel vapor vent apparatus.

23. The fuel tank vent system of claim 20 , wherein the valve closer is a spring, the fuel vapor vent apparatus includes a container and a tube, the container contains the second valve and the valve closer in a chamber formed in the container, the tube is coupled to an annular side wall included in the container at a transition aperture formed in the side wall so that a tube axis of the tube is transverse to the controller axis which extends through the chamber, the side wall extends away from the first vent controller to a top wall included in the container to provide the chamber with a spring space defined between the side wall and the top wall, the spring is positioned in the spring space, and the second vent controller includes a follower sleeve surrounding the spring and engaging the side wall to slide along the side wall to guide the second valve along the controller axis upon movement of the second valve between the opened position and the closed position.

24. The fuel tank vent system of claim 20 , wherein the second valve includes a disk, the valve opener includes an engagement sleeve arranged to engage the first vent controller when the first vent controller is coupled to the fuel vapor vent apparatus and a plurality of spaced-apart connector arms connecting the disk and the engagement sleeve, the valve closer is a spring, and the second vent controller includes a follower sleeve coupled to the disk and engaging the fuel vapor vent apparatus to slide along the fuel vapor vent apparatus to guide the disk along the controller axis upon movement of the valve between the opened position and the closed position.

25. The fuel tank vent system of claim 20 , wherein the controller housing includes a body portion that contains the first valve and is coupled to the fuel vapor vent apparatus, a head portion that is narrower than the body portion and extends into the outlet passageway to establish a sealed connection between the head portion and the fuel vapor vent apparatus, and a V-shaped groove located between the body portion and the head portion and the V-shaped groove is configured to break in response to displacement of the body portion relative to the head portion and the fuel vapor vent apparatus due to application of the displacement force to the body portion.

26. The fuel tank vent system of claim 25 , wherein the body portion includes a shoulder extending radially inwardly relative to the head portion and the second vent controller includes an engagement sleeve surrounded by the head portion and engaging the shoulder to position the valve in the opened position when the body portion is coupled to the fuel vapor vent apparatus.

27. The fuel tank vent system of claim 20 , wherein the second valve is positioned between the valve opener and the valve closer.

28. The fuel tank vent system of claim 20 , wherein the valve opener is positioned between the first valve and the second valve.

29. A fuel tank vent system comprising

a fuel vapor vent apparatus adapted to be coupled to a fuel tank to discharge fuel vapor located in the fuel tank to an external destination outside the fuel tank,

a first vent controller coupled to the fuel vapor vent apparatus and adapted to control discharge of fuel vapor from the fuel tank through the fuel vapor vent apparatus to the external destination and block discharge of liquid fuel from the fuel tank through the fuel vapor vent apparatus to the external destination, and

a second vent controller mounted for movement relative to the fuel vapor vent apparatus from an opened position allowing discharge of fuel vapor from the fuel tank through the fuel vapor vent apparatus to the external destination to a closed position blocking discharge of fuel vapor and liquid fuel from the fuel tank through the fuel vapor vent apparatus to the external destination in response to disablement of the first vent controller.

30. The fuel tank vent system of claim 29 , wherein the first vent controller includes a controller housing coupled to the fuel vapor vent apparatus and a first valve positioned in the controller housing and the second vent controller includes a second valve arranged to move in the fuel vapor vent apparatus from the opened position to the closed position in response to displacement of at least a portion of the controller housing relative to the fuel vapor vent apparatus.