16117222391 BMW FILLER CAP

It does a few key things. Primarily, it seals the fuel tank opening, preventing fuel from spilling out – obviously important. It also regulates air pressure within the tank, meaning it lets air in and out as fuel is used and added, which prevents a vacuum or pressure buildup. Newer caps often include an emissions control system component too, helping manage fuel vapors. Think of it as the lid on a gas tank – pretty straightforward. It’s a simple part, but crucial. It sits right on top of the fuel tank opening, usually with a rubber seal to make it airtight. It’s what you remove to put gas in and replace to keep everything contained. Well, besides not wanting gas spilling all over the place, a good fuel tank cap prevents fuel vapors from escaping into the atmosphere, which is better for the environment and keeps your car running properly. A loose or damaged cap can trigger a check engine light because it affects the fuel system's pressure. You’ll notice if it’s not sealing right – you might smell fuel, or the check engine light will come on. It also acts like a shield, preventing dirt and debris from getting into the tank and contaminating your fuel. You can often find a replacement pretty easily; places like Fixparts Online usually have a good selection. It’s a cheap fix that can save you from bigger headaches down the road. Built to last: Fuel Tank Cap (MPN 16117222391) includes a 12-month warranty!

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