Fuel tank venting
Patent
·
OSTI ID:5743338
A fuel tank filler neck assembly is described comprising a filler neck adapted for connection to a fuel tank, a plate that pivots between a position restricting the filler neck and a position permitting introduction of fuel through the filler neck, a vent housing having a vapor inlet fitting adapted for connection to the fuel tank separately from the filler neck. The housing also has a vapor outlet fitting connected to the vapor inlet fitting through a vent orifice, a pressure control orifice, and a vacuum relief orifice, a diaphragm vent valve isolating the vent housing from the filler neck and controlling flow through the vent orifice, an actuating arm pivoted with the restrictor plate and adapted to engage the vent valve across the vent orifice when the restrictor plate restricts the filler neck. The actuating arm permits the vent valve to allow vapor flow from the vapor inlet fitting through the vent orifice to the vapor outlet fitting when the restrictor plate permits introduction of fuel through the filler neck. A diaphragm pressure control valve controls flow through the pressure control orifice, and a vacuum relief valve controls flow through the vacuum relief orifice.
- Assignee:
- General Motors Corp., Detroit, MI
- Patent Number(s):
- US 4706708
- OSTI ID:
- 5743338
- Country of Publication:
- United States
- Language:
- English
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