Detach/attach mechanical release cable - AR42.20-P-0590-01SX

Open fuel filler flap.
Lever out plug (1).
Press catch springs (2a) carefully in the direction of the arrow using a screwdriver and pull out mechanical release cable (2) downwards.
Replace O-ring (3) if necessary.

Fig 1: Identifying Plug, Catch Springs, Mechanical Release Cable And O-Ring
Courtesy of MERCEDES-BENZ USA

Fig 2: Identifying Cable Tie, Mechanical Release Cable, Retaining Clamps And Fuel Filler Pipe
Courtesy of MERCEDES-BENZ USA
Remove cable tie (arrow).
Remove mechanical release cable (2) from retaining clamps (4a) on fuel filler pipe (4).
Align the mechanical release cable (2) such that both colored marks (2b) are located at the retaining clamps (4a).
Install in the reverse order.