![]() Thankfully, replacing your vehicle’s gas cap is not expensive. Often an ominous indicator of a future expensive repair, your car’s manufacturer also uses it to tell you your old gas cap has given up. There are other signs to watch for too, one of which is the illumination of the “check engine” light. You know that clicking sound the gas cap makes when you turn it clockwise to close the tank? That’s the sound of the cap’s seal engaging if your vehicle’s current gas cap doesn’t make that sound, it could be one of the first clues that it has failed-or is about to. Specifically, the gas cap seals your car or truck’s gas tank against escaping gasoline vapors. Your vehicle’s gas cap is part of a complex emissions control system that helps prevent pollution that can cause environmental harm. The thing is, a gas cap does a lot more than simply close off your vehicle’s filler neck when you’re done gassing up. The gas cap is one part of your vehicle that we bet you don’t give much thought to in spite of how often you use it.
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