You are asking whether the GAC FCA jeep mailbox refueling gun can be opened? OK.
Under the left hand side of the cab, there is a switch to open the fuel tank cap.
Jeep is a brand, not a model, let alone a piece of clothing. The world's first Jeep off-road vehicle was produced in 1941 to meet the military needs of the US military during World War II. It has a history of 77 years. Chrysler, the originator of Jeep, independently owns this registered trademark.