Why wont Fuel door flap won't stay shut on Vauxhall insignia?

The fuel door flap on a Vauxhall Insignia may not stay shut due to a faulty latch or hinge mechanism, which can become worn or damaged over time. Additionally, dirt or debris in the latch area can prevent it from closing properly. It's also possible that the fuel door itself is misaligned or that the spring mechanism intended to keep it closed is malfunctioning. Checking these components can help identify the issue.