Fill Control Vent System

Fill control and fuel vapor venting are accomplished by:
- A vent baffle, integral to the fuel tank filler cap, extends inside the fuel tank. The evaporative emission valve mounted in the top panel of the fuel tank and the evaporative emission tube attached to the evaporative emission canister also contribute to fill control by regulating pressure in the fuel tank.
- As the fuel level rises to cover the fill vent, pressure rises in the fuel tank, causing fuel to back up and shut off the fuel dispensing nozzle.
- The vent system is designed to provide an air space, (approximately 10 percent of the fuel tank volume) above the fuel level in a full fuel tank.
- The air space allows for thermal expansion of fuel and provides clearance between the fuel level and the evaporative emission valve, which is mounted in the top panel of the fuel tank.
- The clearance is sufficient to allow fuel vapor venting through the evaporative emission valve under all static and most dynamic vehicle conditions.