What is checked regarding the gas cap during an auto inspection?

During an auto inspection, the condition of the gas cap is crucial as it plays an important role in maintaining the vehicle's fuel system integrity and ensuring emissions control. The requirement for the gas cap is that it must close tightly and not leak. A secure gas cap prevents fuel vapors from escaping into the atmosphere, which is essential for reducing emissions and improving fuel efficiency.

If the gas cap is not sealing properly, it can lead to a variety of issues, such as the triggering of a check engine light and potential fuel system contamination. Inspectors will check for proper functionality to ensure that the gas cap fits securely on the fuel filler neck, is free of cracks or other damage, and does not allow any vapors to escape. This inspection helps in adhering to environmental regulations and maintaining optimal vehicle performance.