
The seal for the filler neck that prevents fuel evaporation and keeps contaminants like dirt and water out of the tank.
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The fuel cap is more than just a lid; it is a critical component of the vehicle's evaporative emissions system. It seals the filler neck to prevent fuel vapors from escaping into the atmosphere. A faulty, loose, or missing cap can trigger dashboard warning lights and lead to fuel contamination from external elements like dirt, dust, and moisture.
A genuine cap provides an airtight seal and includes a safety valve that maintains the correct tank pressure.