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What is a Chrysler PT Cruiser gas cap?

A Chrysler PT Cruiser gas cap is simply the cap that seals the fuel filler neck of the car's fuel tank. Like any gas cap, its purpose is to prevent fuel evaporation and maintain the proper pressure within the fuel system. While the basic function is the same across most cars, the specific design and appearance of the PT Cruiser's gas cap might vary slightly depending on the model year and any optional accessories.