Fuel tank venting system

Details Fuel tank venting system Fuel tank venting system

2006-07-25

2006-07-25

Krishnamurthy, Ramesh (Department: 3753)

Fluid handling

Processes

Cleaning, repairing, or assembling

C137S526000, C137S587000, C220S746000, C251S331000

Reexamination Certificate

active

07080657

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.

REFERENCES:
patent: 5259412 (1993-11-01), Scott et al.
patent: 6000426 (1999-12-01), Tuckey et al.
patent: 6003499 (1999-12-01), Devall et al.
patent: 6866056 (2005-03-01), Scott

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