I went around in circles with a 97 Volvo 850 setting EVAP code and it turned out to be that the gas cap release spring/valve for letting air into the tank was a tad to weak allowing the valve to open just a smidgen before the correct vacuum had been reached in the tank to satisfy the EVAP monitoring test.
Since the gas cap was new you didn't think about it right away and it did have some resistance in the valve spring but not enough.
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