Fuel cap with duckbill valve
A valve member provides for the flow of vapors from a fuel tank of an internal combustion engine to escape the fuel tank. The valve member may include a valve and a boss or spacer. The valve is configured to selectively control the flow of vapor from the fuel tank. The boss or spacer is positioned in a predetermined relationship to the valve, and the boss or spacer prevents a deformation of the valve from disrupting the selectively controlled flow of vapor from the fuel tank.
1. A fuel cap comprising:
a valve within the fuel cap, the valve configured to selectively control a flow of vapor from a fuel tank;
a filter configured to remove hydrocarbon material from the flow of vapor released from the fuel tank via the valve; and
a boss positioned in a predetermined relationship to the valve,
wherein the boss prevents a deformation of the valve from disrupting the selectively controlled flow of vapor from the fuel tank.
2. The fuel cap of claim 1 , further comprising:
a valve member including the valve and the boss.
3. The fuel cap of claim 2 , wherein the boss is spaced from the valve in a direction of a circumference of the valve member.
4. The fuel cap of claim 2 , wherein the boss is spaced from the valve in a direction of the center of the valve member.
5. The fuel cap of claim 1 , wherein the valve is a first valve, the fuel cap further comprising:
a second valve configured to selectively control a flow air into the fuel tank.
6. The fuel cap of claim 1 , further comprising:
a base connected to the valve and the boss, wherein the valve extends from the base in a first direction and the boss extends from the base in a second direction.
7. A fuel cap comprising:
an evaporative emission filter configured to reduce escape of vapors from a fuel tank;
a valve configured to selectively control the escape of vapors from the fuel tank into the evaporative emission filter; and
a spacer positioned in a predetermined relationship to the valve, wherein the spacer prevents deformation in the valve.
8. The fuel cap of claim 7 , wherein the valve, if deformed, disrupts the selectively controlled escape of vapor from the fuel tank.
9. The fuel cap of claim 7 , further comprising:
a tether configured to anchor the fuel cap to the fuel tank or an engine including the fuel tank.
10. The fuel cap of claim 7 , further comprising:
a base connected to the valve and the spacer, wherein the valve extends from the base in a first direction and the spacer extends from the base in a second direction.
11. The fuel cap of claim 7 , further comprising:
a valve member shaped in a disc and comprising the valve.
12. The fuel cap of claim 11 , wherein the spacer is between the valve and an outer circumference of the valve member.
13. The fuel cap of claim 11 , wherein the spacer is between an outer circumference of the valve member and a center of the valve member.
14. The fuel cap of claim 13 , wherein the spacer includes a first ring outside of the valve in a direction of an outer circumference of the valve member.
15. The fuel cap of claim 14 , wherein the spacer includes a second ring that overlaps the valve.
16. The fuel cap of claim 11 , wherein the valve is a first valve, and the valve member includes a second valve configured to selectively control a flow air into the fuel tank.
17. The fuel cap of claim 7 , wherein the evaporative emission filter is an adsorption filter configured to adsorb vapors from the fuel tank.
18. A fuel cap comprising:
a filter; and
a valve member within the fuel cap and adjacent to the filter, the valve member comprising:
a base;
a valve configured to selectively control a flow of vapor from a fuel tank, the valve extending away from the base in a first direction; and
a boss positioned in a predetermined relationship to the valve and extending from the base in a second direction, wherein the boss prevents a deformation of the valve from disrupting the selectively controlled flow of vapor from the fuel tank through the fuel cap.
19. The valve member of claim 18 , wherein the first direction is opposite the second direction.
20. The valve member of claim 18 , wherein the valve comprises a first three-dimensional shape and the boss comprises a second three-dimensional shape.