A vehicle fuel system includes a vapor recovery canister containing at least two carbon beds. Each carbon bed is configured to capture hydrocarbon material associated with fuel vapor discharged from a vehicle fuel tank into the canister.
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1. A fuel vapor recovery canister adapted for use in a vehicle fuel system, the fuel vapor recovery canister comprising a filter bed housing formed to include an interior region, a canister inlet opening into an upstream portion of the interior region, and a canister outlet opening into a downstream
1. A fuel vapor recovery canister adapted for use in a vehicle fuel system, the fuel vapor recovery canister comprising a filter bed housing formed to include an interior region, a canister inlet opening into an upstream portion of the interior region, and a canister outlet opening into a downstream portion of the interior region and communicating with atmosphere,a hydrocarbon filter located in the interior region of the filter bed housing, the hydrocarbon filter including a first carbon bed positioned to lie in fluid communication with any pressurized fuel vapor and vacuum extant in the upstream portion of the interior region and a second carbon bed positioned to lie in fluid communication with any atmosphere extant in the downstream portion of the interior region and in spaced-apart relation to the first carbon bed, anda vapor flow controller configured to direct flow of at least some fuel vapor moving through the fuel vapor recovery canister from the first carbon bed to pass along a first flow path to atmosphere without passing through the second carbon bed during refueling of a vehicle fuel system associated with the fuel vapor recovery canister so that the second carbon bed remains substantially clean for use during normal operation of the vehicle fuel system and for directing the movement of fuel vapor from the first carbon bed to pass along a second flow path to atmosphere after passing through the second carbon bed during normal operation of the vehicle fuel system so that hydrocarbons suspended in fuel vapor passing through the fuel vapor recovery canister can be adsorbed by carbon in the second carbon bed and removed from vapor discharged from the fuel vapor recovery canister during normal operation the vehicle fuel system providing a low level of hydrocarbon discharge to atmosphere during normal operation, wherein the vapor flow controller includes a bypass valve configured to move from a normally closed position to an opened position in response to (i) a fuel tank closure associated with the fuel vapor recovery canister being opened by a user removing a fuel cap and (ii) pressure in a fuel tank associated with the fuel vapor recovery canister being above atmospheric pressure. 2. The fuel vapor recovery canister of claim 1, wherein the bypass valve includes an outlet tube and a flexible diaphragm, the outlet tube is arranged to provide fluid communication between the first carbon bed and atmosphere without passing through the second carbon bed, and the flexible diaphragm is bendable from a first position arranged to block movement of fuel vapor from the first carbon bed into the outlet tube to a second position arranged to allow movement of fuel vapor from the first carbon bed into the outlet tube so that fuel vapor from the first carbon bed is directed to flow through the second carbon bed before being discharged to atmosphere. 3. The fuel vapor recovery canister of claim 2, wherein the bypass valve includes a spring arranged to bias the flexible diaphragm toward the first position arranged to block movement of fuel vapor from the first carbon bed into the outlet tube. 4. The fuel vapor recovery canister of claim 2, wherein the flexible diaphragm has a first side and a second side opposite the first side, the first side of the flexible diaphragm arranged to be exposed to pressure from a fuel tank associated with the fuel vapor recovery canister and to engage the outlet tube to block fuel vapor from moving into the outlet tube and bypass the second carbon bed, the second side of the flexible diaphragm is arranged to be exposed to pressure from the fuel tank associated with the fuel vapor recovery canister when a fuel tank closure associated with the fuel vapor recovery canister is closed and is arranged to be is exposed to atmospheric pressure when the fuel tank closure associated with the fuel vapor recovery canister is opened so that when fuel tank pressure is greater than atmospheric pressure and the fuel tank closure associated with the fuel vapor recovery canister is opened the flexible diaphragm bends to the opened position out of engagement with the outlet tube to allow fuel vapor to move into the outlet tube and bypass the second carbon bed to atmosphere. 5. The fuel vapor recovery canister of claim 1, wherein the vapor flow controller includes a bleed orifice formed in a wall separating the first carbon bed from the second carbon bed to provide a vapor flow passageway that couples the first carbon bed and the second carbon bed for fluid communication to allow fuel vapor to move from the first carbon bed along the second flow path to the second carbon bed and then to atmosphere. 6. The fuel vapor recovery canister of claim 5, wherein the vapor flow controller includes a one-way check valve configured to allow flow of atmospheric air along a third flow path from the second carbon bed to the first carbon bed so that atmospheric air drawn into the fuel vapor recover canister picks up hydrocarbons adsorbed by the second carbon bed and the first carbon bed purging the second carbon bed and the first carbon bed of hydrocarbons. 7. The fuel vapor recovery canister of claim 6, wherein the one-way check valve includes an umbrella valve configured to open and close purge holes formed in the wall separating the first carbon bed and the second carbon bed. 8. A fuel vapor recovery canister adapted for use in a vehicle fuel system, the fuel vapor recovery canister comprising a filter bed housing formed to include an interior region, a canister inlet opening into an upstream portion of the interior region, and a canister outlet opening into a downstream portion of the interior region and communicating with atmosphere,a hydrocarbon filter located in the interior region of the filter bed housing, the hydrocarbon filter including a first carbon bed positioned to lie in fluid communication with any pressurized fuel vapor and vacuum extant in the upstream portion of the interior region and a second carbon bed positioned to lie in fluid communication with any atmosphere extant in the downstream portion of the interior region and in spaced-apart relation to the first carbon bed, anda vapor flow controller configured to direct flow of at least some fuel vapor moving through the fuel vapor recovery canister from the first carbon bed to pass along a first flow path to atmosphere without passing through the second carbon bed during refueling of a vehicle fuel system associated with the fuel vapor recovery canister so that the second carbon bed remains substantially clean for use during normal operation of the vehicle fuel system and for directing the movement of fuel vapor from the first carbon bed to pass along a second flow path to atmosphere after passing through the second carbon bed during normal operation of the vehicle fuel system so that hydrocarbons suspended in fuel vapor passing through the fuel vapor recovery canister can be adsorbed by carbon in the second carbon bed and removed from vapor discharged from the fuel vapor recovery canister during normal operation the vehicle fuel system providing a low level of hydrocarbon discharge to atmosphere during normal operation, wherein the vapor flow controller includes a bleed orifice providing a vapor flow passageway interconnecting the first carbon bed and the second carbon bed to allow fuel vapor from the first carbon bed to pass along the second flow path to atmosphere after passing through the second carbon bed both during normal operation of the vehicle fuel system associated with the fuel vapor recovery canister and during refueling of the vehicle fuel system associated with the fuel vapor recovery canister. 9. The fuel vapor recovery canister of claim 8, wherein the vapor flow controller includes a bypass valve configured to move from a normally closed position to an opened position when a fuel tank closure associated with the fuel vapor recovery canister is opened and pressure in a fuel tank associated with the vapor flow controller is greater than atmospheric pressure. 10. The fuel vapor recovery canister of claim 9, wherein the bypass valve includes an outlet tube and a flexible diaphragm, the outlet tube is arranged to provide fluid communication between the first carbon bed and atmosphere without passing through the second carbon bed, and the flexible diaphragm is bendable from a first position arranged to block movement of fuel vapor from the first carbon bed into the outlet tube to a second position arranged to allow movement of fuel vapor from the first carbon bed into the outlet tube so that fuel vapor from the first carbon bed is directed to flow through the second carbon bed before being discharged to atmosphere. 11. The fuel vapor recovery canister of claim 1, wherein the filter bed housing includes a lower shell and a cover coupled to the lower shell to enclose the interior region, the lower shell is formed to include the canister outlet, and the cover is formed to include the canister inlet. 12. The fuel vapor recovery canister of claim 11, wherein the lower shell is formed to include a plurality of compartments that receive the first carbon bed and the second carbon bed. 13. The fuel vapor recovery canister of claim 11, wherein the bypass valve includes a diaphragm seat that cooperates with the cover to define a valve volume, a flexible diaphragm that divides the valve volume into a lower portion and an upper portion, and an outlet tube in fluid communication with the lower portion of the valve volume that provides a passageway for fuel vapor flowing from the first carbon bed toward the second carbon bed to pass directly to atmosphere without passing through the second carbon bed and the flexible diaphragm is movable within the valve volume to engage and close off or disengage and open the outlet tube. 14. The fuel vapor recovery canister of claim 13, wherein the cover is formed to include a valve-control port opening into the upper portion of the valve volume, the valve-control port adapted to be fluidly coupled a fuel tank filler neck associated with the fuel vapor recovery canister such that upper portion of the valve volume is open to atmosphere when a fuel tank closure associated with the fuel vapor recovery canister is opened by a user removing a fuel cap. 15. A fuel vapor recovery canister comprising a filter bed housing formed to include an interior region, a canister inlet opening into an upstream portion of the interior region, and a canister outlet opening into a downstream portion of the interior region and communicating with atmosphere,a hydrocarbon filter located in the interior region of the filter bed housing, the hydrocarbon filter including a first carbon bed positioned to lie in fluid communication with any pressurized fuel vapor and vacuum extant in the upstream portion of the interior region and a second carbon bed positioned to lie in fluid communication with any atmosphere extant in the downstream portion of the interior region, anda bypass valve arranged to block or allow flow of fuel vapor moving from the first carbon bed toward the second carbon bed directly to atmosphere without interacting with the second carbon bed, the bypass valve configured to move from a normally closed position to an opened position in response to opening of a fuel tank closure associated with the fuel vapor recovery canister by a user removing a fuel cap only when pressure in the fuel tank is above atmospheric pressure so that fuel vapor moving from the first carbon bed toward the second carbon bed is allowed to bypass the second carbon bed and to move to atmosphere directly keeping the second carbon bed clean for interaction with fuel vapor flowing through the fuel vapor recovery canister during normal operation of a vehicle fuel system associated with the fuel vapor recovery canister. 16. The fuel vapor recovery canister of claim 15, wherein the bypass valve includes an outlet tube and a flexible diaphragm, the outlet tube is arranged to provide fluid communication between the first carbon bed and atmosphere without passing through the second carbon bed, and the flexible diaphragm is bendable from a first position arranged to block movement of fuel vapor from the first carbon bed into the outlet tube to a second position arranged to allow movement of fuel vapor from the first carbon bed into the outlet tube so that fuel vapor from the first carbon bed is directed to flow through the second carbon bed before being discharged to atmosphere. 17. The fuel vapor recovery canister of claim 16, wherein the bypass valve includes a spring arranged to bias the flexible diaphragm toward the first position arranged to block movement of fuel vapor from the first carbon bed into the outlet tube. 18. A fuel vapor recovery canister comprising a filter bed housing formed to include an interior region, a canister inlet opening into an upstream portion of the interior region, and a canister outlet opening into a downstream portion of the interior region and communicating with atmosphere,a hydrocarbon filter located in the interior region of the filter bed housing, the hydrocarbon filter including a first carbon bed positioned to lie in fluid communication with any pressurized fuel vapor and vacuum extant in the upstream portion of the interior region and a second carbon bed positioned to lie in fluid communication with any atmosphere extant in the downstream portion of the interior region, anda bypass valve arranged to block or allow flow of fuel vapor moving from the first carbon bed toward the second carbon bed directly to atmosphere without interacting with the second carbon bed, the bypass valve configured to move from a normally closed position to an opened position in response to opening of a fuel tank closure associated with the fuel vapor recovery canister by a user removing a fuel cap when pressure in the fuel tank is above atmospheric pressure so that fuel vapor moving from the first carbon bed toward the second carbon bed is allowed to bypass the second carbon bed and to move to atmosphere directly keeping the second carbon bed clean for interaction with fuel vapor flowing through the fuel vapor recovery canister during normal operation of a vehicle fuel system associated with the fuel vapor recovery canister, wherein the bypass valve includes an outlet tube and a flexible diaphragm, the outlet tube is arranged to provide fluid communication between the first carbon bed and atmosphere without passing through the second carbon bed, and the flexible diaphragm is bendable from a first position arranged to block movement of fuel vapor from the first carbon bed into the outlet tube to a second position arranged to allow movement of fuel vapor from the first carbon bed into the outlet tube so that fuel vapor from the first carbon bed is directed to flow through the second carbon bed before being discharged to atmosphere, and wherein the flexible diaphragm has a first side and a second side opposite the first side, the first side of the flexible diaphragm arranged to be exposed to pressure from a fuel tank associated with the fuel vapor recovery canister and to engage the outlet tube to block fuel vapor from moving into the outlet tube and bypass the second carbon bed, the second side of the flexible diaphragm is arranged to be exposed to pressure from the fuel tank associated with the fuel vapor recovery canister when a fuel tank closure associated with the fuel vapor recovery canister is closed and is arranged to be is exposed to atmospheric pressure when the fuel tank closure associated with the fuel vapor recovery canister is opened so that when fuel tank pressure is greater than atmospheric pressure and the fuel tank closure associated with the fuel vapor recovery canister is opened the flexible diaphragm bends to the opened position out of engagement with the outlet tube to allow fuel vapor to move into the outlet tube and bypass the second carbon bed to atmosphere. 19. A fuel vapor recovery canister comprising a filter bed housing formed to include an interior region, a canister inlet opening into an upstream portion of the interior region, and a canister outlet opening into a downstream portion of the interior region and communicating with atmosphere,a hydrocarbon filter located in the interior region of the filter bed housing, the hydrocarbon filter including a first carbon bed positioned to lie in fluid communication with any pressurized fuel vapor and vacuum extant in the upstream portion of the interior region and a second carbon bed positioned to lie in fluid communication with any atmosphere extant in the downstream portion of the interior region,a bypass valve arranged to block or allow flow of fuel vapor moving from the first carbon bed toward the second carbon bed directly to atmosphere without interacting with the second carbon bed, the bypass valve configured to move from a normally closed position to an opened position in response to opening of a fuel tank closure associated with the fuel vapor recovery canister by a user removing a fuel cap when pressure in the fuel tank is above atmospheric pressure so that fuel vapor moving from the first carbon bed toward the second carbon bed is allowed to bypass the second carbon bed and to move to atmosphere directly keeping the second carbon bed clean for interaction with fuel vapor flowing through the fuel vapor recovery canister during normal operation of a vehicle fuel system associated with the fuel vapor recovery canister, anda bleed orifice formed in a wall separating the first carbon bed from the second carbon bed to provide a vapor flow passageway interconnecting the first carbon bed and the second carbon bed to allow fuel vapor to move from the first carbon bed both when the bypass valve is closed and opened. 20. A fuel vapor recovery canister comprising a filter bed housing formed to include an interior region, a canister inlet opening into an upstream portion of the interior region, and a canister outlet opening into a downstream portion of the interior region and communicating with atmosphere,a hydrocarbon filter located in the interior region of the filter bed housing, the hydrocarbon filter including a first carbon bed positioned to lie in fluid communication with any pressurized fuel vapor and vacuum extant in the upstream portion of the interior region and a second carbon bed positioned to lie in fluid communication with any atmosphere extant in the downstream portion of the interior region, anda bypass valve arranged to block or allow flow of fuel vapor moving from the first carbon bed toward the second carbon bed directly to atmosphere without interacting with the second carbon bed, the bypass valve configured to move from a normally closed position to an opened position in response to opening of a fuel tank closure associated with the fuel vapor recovery canister by a user removing a fuel cap when pressure in the fuel tank is above atmospheric pressure so that fuel vapor moving from the first carbon bed toward the second carbon bed is allowed to bypass the second carbon bed and to move to atmosphere directly keeping the second carbon bed clean for interaction with fuel vapor flowing through the fuel vapor recovery canister during normal operation of a vehicle fuel system associated with the fuel vapor recovery canister, wherein the bypass valve includes a one-way check valve configured to allow flow of atmospheric air from the second carbon bed to the first carbon bed. 21. The fuel vapor recovery canister of claim 20, wherein the one-way check valve includes an umbrella valve configured to open when atmospheric air flows from the second carbon bed toward the first carbon bed.
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