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Fuel vapor purging diagnostics

  • US 7,900,608 B2
  • Filed: 10/07/2010
  • Issued: 03/08/2011
  • Est. Priority Date: 03/06/2009
  • Status: Active Grant
First Claim
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1. A method of monitoring reverse flow of fuel vapors and/or air through a vehicle fuel vapor recovery system, said fuel vapor recovery system coupled to an engine intake of a boosted internal combustion engine, the method comprising:

  • during boost, when the fuel vapor recovery system is commanded to be sealed from the intake, indicating degradation based on a pressure value at a venturi in the fuel vapor recovery system.

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