Vehicles equipped with the available Capless Fuel Fill do not have traditional twist-off gas caps. Instead, when a fuel nozzle is inserted, the nozzle pushes open two sets of doors so you can refuel. These doors will automatically seal and remain airtight after the refueling nozzle is removed.

How does a capless gas tank work?

You simply flip open the fuel door and stick the pump nozzle in. Not having a twist-on/off cap is one less contact with a gasoline-vapor odor source. ... Capless systems use various mechanisms in the fuel-filler neck that make it nearly impossible to stuff in a garden hose and drain a victim's tank.

What is the point of a capless gas tank?

The capless fuel filler system helps avoid splashback, fuel theft and prevents fuel vapors from escaping into the atmosphere.