Operation

OPERATION

All vehicles are designed to pass a full 360 degree rollover test without fuel leakage. To accomplish this, fuel and vapor flow controls are required for all fuel tank connections. Check and control valves are mounted into the top of the fuel tank. These valves are components of the evaporative emissions system.

The evaporative emissions system is designed to control the release of fuel vapors into the atmosphere. The fuel tank check valve and control valve are used to reduce emissions due to the venting of vapor expansion within the fuel tank. When fuel evaporates from the fuel tank, vapors pass through a vent hose to the evaporative charcoal canister where they are temporarily held. When the engine is running, the vapors are drawn into the intake manifold. In addition, fuel vapors produced during vehicle refueling are allowed to pass through the vent hose to the evaporative charcoal canister for temporary storage (prior to being drawn into the intake manifold). The fuel tank check valve and control valve are non-serviceable components of the fuel tank assembly.

An inlet check valve prevents fuel from splashing back on the customer during vehicle refueling. This valve is also a non-serviceable component of the fuel tank assembly.