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The small hole in the fuel cap is essential for regulating pressure in the fuel system. If blocked, it can lead to severe damage and costly repairs. Proper ventilation prevents vacuum formation, ensuring smooth fuel flow and protecting the tank from deformation. Modern vehicles utilize an EVAP system to manage fuel vapors, enhancing efficiency and reducing emissions. Signs of ventilation issues include unusual engine power loss and a hissing sound when opening the cap. Regular maintenance and cleaning around the fuel cap can prevent problems, and timely intervention can save on expensive repairs.