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This is indicative of an LDP failure direct to intake from PSI generated or EVAP N80 remaining open during fuel up and a gravity or siphon effect takes place pooling fuel within the intake & which results in the symptoms as you aforementioned.
Before fill up ..........crimp off the N80 and LDP lines and see if it doesn't happen when you fire the POS up.
Before fill up ..........crimp off the N80 and LDP lines and see if it doesn't happen when you fire the POS up.