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1. Prevents Fuel Leaks
The fuel cap keeps the tank tightly closed.

Prevents fuel vapor or liquid from escaping, reducing waste and the risk of fire.

2. Prevents Dirt & Water Ingress
Blocks dust, sand, rainwater, and debris from entering the fuel tank.

Protects the fuel system from contamination that can damage the pump, filter, and engine.

3. Controls Pressure in the Tank
Many modern fuel caps have a venting or pressure relief system.

Helps maintain the correct pressure in the fuel system – important for engine performance and combustion efficiency.

4. Prevents Fuel Theft
Some fuel caps are equipped with a security lock.

Prevents theft or dumping of fuel by irresponsible parties.

5. Improves Fuel Efficiency & Engine Performance
A properly sealed fuel system helps the EVAP (evaporative emission control system) system function optimally.

Reduces fuel vapor emissions into the air and improves fuel economy.

6. Environmental Compliance
In many countries, fuel caps play a role in controlling the release of hydrocarbon vapors into the atmosphere.

A damaged fuel cap can cause vehicles to fail emissions tests.

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