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On the inside, the caps can have two different breathing systems: vented or non-vented. A non-vented fuel cap is recommended when your fuel tank is ventilated through the filler neck, whereas the vented fuel cap is equipped with a special breathing valve so that it can be used on non-ventilated fuel tanks. This cap is fitted with a venting valve system which prevents evaporation of harmful car fuel gases and complies with the EEC directive No. 70/221. In case of an accident the safety valve prevents fuel leaking from the tank. In addition, a malfunctioning cap can be the cause of a check engine light. For this reason cap replacement can almost be seen as a good maintenance habit. Order one of these caps to ensure this part of your Corvette
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