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Only thing I could think of is a vent solenoid sticking and making a vacuum leak when the purge solenoid engages, but that should also be giving you evap codes. Since it takes three times to set the evap, maybe the purge vacuum eventually closes the vent solenoid. If you have a scanner that allows you to monitor, fill the tank and then see how long it takes for the fuel tank pressure to go negative.
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