Remove the protector (A).

Disconnect the fuel filler hose (A).

Disconnect the leveling hose quick-connector (A).

Disconnect the ventilation hose quick-connector (A).

Remove the rear-LH wheel, tire, and the inner wheel house.
Remove the filler-neck assembly from the vehicle after removing the bracket mounting nuts (A).

Installation is reverse of removal.
Filler-neck assembly bracket installation nut :
3.9 ~ 5.9 N.m (0.4 ~ 0.6 kgf.m, 2.9 ~ 4.3 lb-ft)