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Your fuel cap does more than just close your tank. It helps maintain proper pressure in your fuel system and prevents harmful vapors from escaping. A secure seal keeps dirt, debris, and moisture out, which protects your fuel quality and helps your engine run efficiently. Driving without a proper fuel cap can trigger your check engine light, reduce fuel efficiency, and even lead to long-term damage in your EVAP system. If it’s loose, cracked, or missing, it’s worth replacing right away. Luckily, it’s one of the easiest fixes you can make. Save this post for a quick reminder later and get your replacement at CarParts.com!