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Methods and systems for diagnosing fuel tank oil-canning

  • US 9,771,899 B2
  • Filed: 03/30/2015
  • Issued: 09/26/2017
  • Est. Priority Date: 03/30/2015
  • Status: Active Grant
First Claim
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1. A method for a fuel system, comprising:

  • determining a fuel tank pressure based on a fuel system sensor;

    indicating fuel tank oil-canning responsive to a higher than a threshold rise in the fuel tank pressure following application of vacuum to a fuel tank while each of a fuel temperature and a fill level remains unchanged; and

    responsive to the fuel tank oil-canning, discontinuing the application of vacuum and venting the fuel tank to atmosphere.

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