WARNING: This page is about a different car, the 2018 Hyundai Accent. However, it is still accessible from the selected car via links, so may be relevant.
Open the fuel filler door, and then remove the filler-neck assembly mounting screws (A).
Courtesy of HYUNDAI MOTOR AMERICA
Disconnect the fuel filler hose (A) and vapor hose (B).
Courtesy of HYUNDAI MOTOR AMERICA
Remove the filler-neck assembly from the vehicle after removing the bracket mounting bolt (A).