How to open gas cap on vw Passat?

To open the gas cap on the Volkswagen Passat, unlock the vehicle and push the gas tank door and twist the gas cap counterclockwise. But why is the car gas cap so important. The gas cap, also known as the fuel filler cap, is a simple but important component that is found on the vast majority of road going cars and trucks. Their purpose is simple; to prevent dirt, debris, and dust from entering the gas tank, as well as providing a reliable seal.Simply having a loose cap can wreak minor havoc with the emissions system. But fortunately it will cost only around $16 to have it replaced making it a very cheap and important repair to Your vehicle.