What is a fuel cap?

A fuel cap is a cover that seals the opening of a vehicle's fuel tank to prevent fuel from evaporating and to keep dirt and debris out of the tank. It also helps to maintain proper pressure within the fuel system. Fuel caps are typically made of durable materials such as plastic or metal and are designed to be securely fastened to the fuel tank to prevent leaks. Some fuel caps are equipped with a lock to prevent fuel theft. It is important to regularly check and replace a damaged or missing fuel cap to ensure proper functioning of the vehicle's fuel system.