Gas tank caps: They play an important part in your car’s fuel system, even setting off a check engine light on the dashboard if they go missing or aren’t screwed on correctly after refueling. Yet somehow, they’re one of the least inspired-looking parts on a car. They’re just utilitarian and black. Unless they’re yellow -– then they have a special meaning. Yellow gas caps serve as an alert, letting drivers or gas station attendants (looking at you, New Jersey) know
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