5 Secrets About the Fuel Tank Cap That 99% of Seasoned Drivers Don’t Know Most drivers think the fuel tank cap is just a lid — twist it open, fill up, twist it back, done. But this small piece of your car plays a much bigger role than you might realize. Your fuel cap seals the fuel system, maintaining proper pressure and preventing harmful vapors from escaping. A loose or damaged cap can actually trigger your check engine light, reduce fuel efficiency, and even cause your car to fail an emission
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