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Ran a diagnostic test and the trouble code of po496 came up how do I fix this

Vehicle: 2007 GMC Envoy 4.2 Engine size

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P0496 Evap system flow during non purge

When you have this code condition the FTP has detected vacuum in the fuel tank when a purge was not commanded, this happens when the purge vavle stick and allow vacuum to enter the fuel tank, This is most likely will be with the purge solenoid sticking,

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