Fuel caps play a vital role in maintaining vehicle safety, performance, and fuel efficiency. However, many people are unaware of their significance or why regulations and inspections exist around them. A properly functioning fuel cap ensures the fuel system operates efficiently, preventing leaks and emissions. Failing to replace the fuel cap after refueling or leaving it behind can lead to significant issues. Damaged, cracked, or worn-out fuel caps should be replaced immediately. Modern locking fuel caps not only enhance security but also help maintain the air pressure in the fuel tank, ensuring optimal performance