Only after adding fuel rough or hard to start check engine light code P0496

2 common failures that will cause this condition EVAP canister purge valve / circuit malfunction EVAP vent valve / solenoid / circuit malfunction The only way to determine the actual failure is via a professional scan test along with the required subsequent *hands-on* testing. Until repair is completed.. Holding accelerator pedal to floor while cranking engine following fuel fill will help. NEVER 'top off' fuel tank when refueling .. That will lead to this type EVAP system failure...again!