Gas flaps have a secret emergency release handle fitted in the trunk behind the cover. Pulling the release opens the gas flap.
Why can't I open my gas tank?
Step 1: Inspect the lever for damage: In many cases, a mechanically-operated fuel door will be unable to open if there is mechanical damage to the handle itself. In many cases, the handle is connected to a cable underneath the floorboard on the driver side. This connection can break if the handle is pulled hard enough.2016-12-09
Where is the gas tank button on a Mitsubishi Outlander?
Locate the fuel door release lever right next to the driver's seat on the floorboard. It can be difficult to find because of its dark color, but it's there. Pull the lever upward to release the fuel door. From there, you should be able to open the gas cap by twisting it counter-clockwise.