What's the reason for not being able to open the fuel tank cap?

[LeDelaney]

You can insert a small wooden piece into the gap of the fuel tank cap to pry it open, while remembering to pull the fuel tank cap's latch switch during the process. Here is a related introduction to three methods of opening a car's fuel tank cap: 1. Mechanical key opening method: This type of fuel tank cap switch is relatively rare, usually found in some rugged off-road vehicles. Most family cars do not use mechanical keys for opening, as it is relatively more complicated to use. 2. In-car switch method: The in-car switch is currently the most common way to open the fuel tank door, offering more convenience compared to using a key. The location of the in-car switch varies across different car models; some are found on the floor to the left of the driver's seat, some on the left front door panel or the center console, all marked with a fuel pump symbol. 3. Press-to-open method: The press-to-open fuel tank door is currently the most convenient method, requiring only parking the car before refueling. However, if refueling is not done while parked, the central locking must be engaged; otherwise, the fuel tank cap can be opened.