Fill Control Vent System

Fill control and fuel vapor venting is accomplished by the following method:
- A vent line is attached to the top of the fuel tank filler pipe and two fittings located at the top rear of the fuel tank.
- As the fuel level rises to cover the fill vents, pressure rises in the fuel tank, causing fuel to back up and shut off the fuel dispensing nozzle.
- The two evaporative emission valves, which are mounted in the top panel of the fuel tank and the evaporative emission hose attached to the evaporative emissions canister (EVAP canister), also contribute to fill control by controlling pressure in the fuel tank.
- 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 two evaporative emission valves mounted in the top panel of the fuel tank.
- Fuel vapors in the sealed fuel tank are vented through the evaporative emission valve to the evaporative emissions canister.
- The clearance is sufficient to allow fuel vapor venting through the evaporative emission valve under all static and most dynamic vehicle conditions.