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A system for a vehicle is provided herein. The system includes a fuel vapor canister comprising a shell, a compression plate within the shell and an end cap. The end cap includes a double sided spring interface and a double sided shell sealing surface having double sided identical grooves, only one

A system for a vehicle is provided herein. The system includes a fuel vapor canister comprising a shell, a compression plate within the shell and an end cap. The end cap includes a double sided spring interface and a double sided shell sealing surface having double sided identical grooves, only one of which is sealed to the shell. The system further includes a spring coupled to the compression plate and only one spring interface.

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1. A fuel vapor canister comprising: a shell;a compression plate within the shell;an end cap with a hollow conical frustum shape including a double sided spring interface and a double sided shell sealing surface having double sided identical grooves, only one of which sealed to the shell; anda sprin

1. A fuel vapor canister comprising: a shell;a compression plate within the shell;an end cap with a hollow conical frustum shape including a double sided spring interface and a double sided shell sealing surface having double sided identical grooves, only one of which sealed to the shell; anda spring coupled to the compression plate and only one interface. 2. The canister of claim 1, where the hollow conical frustum shape includes an open end exposing an interior cavity of the end cap, the open end located at a maximum circumference of the end cap. 3. The canister of claim 2, where the double sided shell sealing surface is a ring structure positioned around a perimeter of the end cap proximate to the open end. 4. The canister of claim 3, where one of the double sided identical grooves is included within an upper region of the double sided shell sealing surface and the other one of the double sided identical grooves is included within a lower region of the double sided shell sealing surface, the double sided identical grooves circumnavigating the end cap and corresponding to different circumferences of an end cap body, each identical groove having an inner and an outer radius identical to an inner and outer radius of the shell for receiving an end surface of the shell. 5. The canister of claim 2, where the double sided spring interface is located at a closed end of the end cap, the closed end located at a minimum circumference of the end cap. 6. The canister of claim 5, where a first flat surface of the double sided spring interface is located on an exterior of the end cap and a second flat surface of the double sided spring interface is located within the interior cavity of the end cap. 7. The canister of claim 6, where the spring is coupled to the first flat surface and the shell is coupled to the upper region resulting in a compact configuration or the spring is coupled to the second flat surface and the shell is coupled to the lower region resulting in an expanded configuration, where the compact configuration accommodates a smaller volume of adsorptive material than the expanded configuration. 8. The canister of claim 1, where the vapor canister is coupled to a fuel system of the engine to adsorb fuel vapors. 9. The canister of claim 8, further including a vent line and a vent valve to control ambient air passage into the vapor canister to purge vapors through a purge line to an intake manifold. 10. The canister of claim 9, further including a purge valve to regulate vapors entering the intake manifold. 11. A hydrocarbon storage canister comprising: a shell;a compression plate; andan end cap shaped as a hollow conical frustum including a shell sealing ring at a greater circumference of the end cap than a double sided spring interface that projects into an interior region of the shell, the shell sealing ring including an upper and a lower sealing surface wherein only the upper sealing surface is sealed to the shell. 12. The canister of claim 11, where the double sided spring interface is surrounded by interior walls of the shell. 13. The canister of claim 11, where the hollow conical frustum has an open end proximate to the shell sealing ring and a closed end corresponding with the double sided spring interface, and wherein the lower sealing surface of the shell sealing ring is not sealed to any component. 14. The canister of claim 13, where the double sided spring interface includes a first flat surface coupled to a spring such that the spring couples the end cap to the compression plate, and a second flat surface positioned within an interior cavity of the end cap and is not coupled to the spring, and wherein the upper and lower sealing surfaces are mirror images of each other about a plane perpendicular to a central axis of the shell. 15. The canister of claim 11, where the upper sealing surface is positioned on a plane corresponding to a smaller circumference of the end cap relative to the lower sealing surface. 16. The canister of claim 11, where the upper sealing surface is sealed to the shell such that the hydrocarbon storage canister has a smaller volume than if the lower sealing surface were sealed to the shell. 17. The canister of claim 16, where the smaller volume is approximately 0.5 liters. 18. A hydrocarbon storage canister comprising: a shell;a compression plate; andan end cap shaped as a hollow conical frustum including a shell sealing ring at a greater circumference of the end cap than a double sided spring interface that projects away from an interior region of the shell, the shell sealing ring including an upper and a lower sealing surface wherein only the lower sealing surface is sealed to the shell. 19. The canister of claim 18, where the double sided spring interface is outside from interior walls of the shell. 20. The canister of claim 18, where the hollow conical frustum has an open end proximate to the shell sealing ring and a closed end corresponding with the double sided spring interface, and wherein the upper sealing surface of the shell sealing ring is not sealed to any component. 21. The canister of claim 20, where the double sided spring interface includes a first flat surface positioned on an outer surface of the end cap exterior to a cavity of the end cap and is not coupled to a spring, and a second flat surface coupled to the spring such that the spring couples the end cap to the compression plate, and wherein the upper and lower sealing surfaces are mirror images of each other about a plane perpendicular to a central axis of the shell. 22. The canister of claim 18, where the lower sealing surface is positioned on a plane corresponding to a larger circumference of the end cap relative to the upper sealing surface. 23. The canister of claim 18, where the lower sealing surface is sealed to the shell such that the hydrocarbon storage canister has a larger volume than if the upper sealing surface were sealed to the shell. 24. The canister of claim 23, where the smaller volume is approximately 1.0 liters.