Fuel tank venting system

Details Fuel tank venting system Fuel tank venting system

2005-03-15

2005-03-15

Krishnamurthy, Ramesh (Department: 3753)

Fluid handling

Processes

Cleaning, repairing, or assembling

C137S526000, C137S550000, C137S843000, C220S303000, C220SDIG003, C251S331000

Reexamination Certificate

active

06866056

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. The vent disc preferably includes a disc flange and a diaphragm projection. 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. Air flows around the unsealed perimeter of the vent diaphragm through the at least one air passage. In a second embodiment, the fuel tank venting system is contained in a wall of the fuel tank.

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patent: 5816430 (1998-10-01), Gruber
patent: 200 03 768 (2000-05-01), None

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