Fuel tank venting system

a fuel tank and venting technology, applied in the direction of functional valve types, containers, transportation and packaging, etc., can solve the problems of not allowing fuel vapors into the atmospher
US20060157117A1Inactive Publication Date: 2006-07-20COUNTRY INDS TECH
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
COUNTRY INDS TECH
Publication Date
2006-07-20
Estimated Expiration
Not applicable · inactive patent

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Abstract

A fuel tank venting system includes a fuel cap, a vent diaphragm and a vent disc. A valve cavity with a substantially concave bottom is formed in a bottom of the fuel cap. At least one air passage is formed through the vent disc. A substantially convex surface is formed on a top of the diaphragm projection. The vent diaphragm is retained between the substantially concave bottom and the substantially convex surface. When air is needed for fuel flow, a vacuum within the fuel tank pulls the perimeter of the vent diaphragm downward, which breaks a seal with the substantially concave bottom to allow air flow. In a second embodiment, the fuel tank venting system is contained in a wall of the fuel tank. In a third embodiment, the fuel tank venting system is contained in a fuel vent body, which is attached to the fuel tank.
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Description

CROSS-REFERENCES TO RELATED APPLICATIONS

[0001] This is a continuation-in-part patent application taking priority from a utility patent application having Ser. No. 10 / 846,296 filed on May 14, 2004.BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The present invention relates generally to venting fuel tanks and more specifically to a fuel tank venting system, which may be located in a fuel cap or in a wall of the fuel tank.

[0004] 2. Discussion of the Prior Art

[0005] Fuel tanks used with small engines usually allow fuel vapors to continually vent to the atmosphere. Sometimes check valves are incorporated in the gas cap to prevent the escape of fuel vapors. Some types of check valves seal well under high pressure, but allow fuel vapor seepage under low pressure. With marine fuel tanks, a thumb screw in the fuel cap is used to seal the marine fuel tank, when not in use. The thumb screw is opened in most cases to run the engine. During the time when the engine is run...

Claims

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