Disconnect the fuel filler hose (A).
Disconnect the leveling hose quick-connector (A) and the vacuum tube quick-connector (B) connecting the canister and the fuel tank air filter.
Open the fuel filler door and unfasten the filler-neck assembly mounting screws (A).
Remove the rear-LH wheel & tire, and the inner wheel house (Refer to "DS" group in this SERVICE MANUAL).
Remove the bracket mounting nuts (A) and remove the filler-neck assembly.
Install the filler-neck assembly in according to the reverse order of "REMOVAL" procedure.