Fuel caps Gates fuel caps offer a durable construction of a wear-resistant thermoplastic compound to ensure tight closing and to avoid spills and leaks. Gates’ standard fuel cap range includes locking and non- locking caps, and vented and non-vented caps. The locking fuel caps lock securely and make tampering with your fuel tank impossible.  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. All fuel caps are easy to install. In order to reduce air pollution as much as possible Gates supplies a special ecological cap. It is fitted with a venting valve system which prevents evaporation of harmful car fuel gasses and complies with the EEC directive no.70/221. In case of an accident the safety valve prevents fuel leaking from the tank. More information on sizes and applications can be found in Gates Fuel Cap catalogue E/70328.