Which component must be inspected as part of the liquid fuel leak inspection?

• A. Oil filter
• B. Air filter
• C. Gas cap
• D. Muffler

Answer: (C)

Liquid fuel leak inspection targets anything in the fuel system that could allow gasoline to escape as a liquid, not just vapors. The gas cap is inspected because it sits on the fuel filler neck and must seal tightly; a damaged, loose, cracked cap, or worn gasket can let liquid fuel spill or seep out, especially during refueling or vehicle movement. The other components listed aren’t part of the liquid fuel path: the oil filter handles engine oil leaks, the air filter is for the intake air, and the muffler is part of the exhaust system. So, checking the gas cap is essential to prevent liquid fuel leaks and ensure proper sealing of the fuel system.