System for controlling the release of fuel vapors from a vehicle fuel tank
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United States of America Patent
Stats
-
Dec 27, 1994
Issued Date -
N/A
app pub date -
Mar 6, 1990
filing date -
Mar 26, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fuel filler pipe assembly is provided which controls the release of fuel vapors from a vehicle fuel tank so as to limit the amount of fuel vapor released into the atmosphere. The assembly includes an outer tube which is partitioned into two conduits--one for carrying fuel to the vehicle's fuel tank and the other for carrying fuel vapors to an on board vapor capture device. Passage of fuel vapors to the vapor capture device is controlled by a valve which itself is controlled by the attachment and detachment of a fuel filler cap to the assembly such that attachment of the cap causes the valve to close while detachment causes it to open. In certain preferred embodiments, the assembly includes a second valve for preventing the passage of substantial quantities of liquid fuel to the vapor capture device.
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