This part seals off your fuel tank. It prevents fuel from spilling out, keeps dirt and moisture from getting in, and helps maintain the correct pressure within the fuel system. Basically, it’s the lid to your gas tank. It's a pretty straightforward part, honestly. It sits right where you put the gas nozzle in. When you unscrew it, it lets you access the fuel tank. When it’s on tight, it creates that seal I mentioned. Modern caps also work with the vehicle's emissions control system; they allow a little bit of air in to prevent a vacuum from forming as you use fuel, and they vent fuel vapors back into the system, not into the atmosphere. It’s more important than people often realize. A missing or damaged fuel filler cap can cause a lot of problems. You’ll notice if it’s missing, obviously, because fuel could splash out when you fill up. But even a cracked or worn – out cap can cause issues. It can trigger a check engine light because of fuel vapor leaks. Those vapors are harmful to the environment, and the system is designed to detect when they're escaping. It also keeps contaminants like water and debris out of your fuel—that’s important for engine performance. You can find replacements pretty easily, even online at places like Fixparts Online, and they’re usually a simple DIY fix. A faulty cap doesn’t usually cause catastrophic failure, but it is something you want to address promptly. Support that lasts: Fuel Filler Cap (MPN 16116754491) includes a 12-month warranty!

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