Method and apparatus for monitoring for a restriction in a stage II fuel vapor recovery system
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United States of America Patent
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Jun 5, 2012
Grant Date -
Dec 3, 2009
app pub date -
May 28, 2009
filing date -
May 28, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
Systems and methods for detecting a failure in a Stage II fuel vapor recovery system are disclosed. An exemplary failure is a restriction in the vapor recovery system. In one detection system dispensing points may be flagged if it is determined that there has been a series of detected A/L ratios at the respective dispensing point below a first threshold. Further, an estimated ORVR penetration percentage may be determined for each dispensing point. In a second detection system an average A/L ratio for each dispensing point may be determined. The average A/L ratio may be an approximation of the average A/L ratio for non-ORVR transactions.
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