Fuel Tank: Description and Operation

NVLD Fuel Tank:

Non US Fuel Tank:

The fuel tank is constructed of a plastic material. Its main functions are for fuel storage and for placement of the fuel pump module. The tank is made from High density Polyethylene (HDPE) material. If equipped with ORVR (Onboard Refueling Vapor Recovery) it has been added to the fuel tank to control refueling vapor emissions.

The PZEV (Partial Zero Emission Vehicle) fuel tank is a steel tank with the check valves, and hoses inside of the tank. This system uses the NVLD (Natural Vacuum Leak Detection) system for leak detection for both plastic and steel tanks.

All models 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.

All models are equipped with either one or two check valves mounted into the top of the fuel tank (or pump module). On the PZEV system the check valves are inside of the fuel tank. The valves are non-serviceable parts.

PZEV Fuel Tank:

An evaporation control system is connected to the check valve (s)/control valve to reduce emissions of fuel vapors into the atmosphere, when the tank is vented due to vapor expansion in the tank. When fuel evaporates from the fuel tank, vapors pass through vent hoses or tubes to a 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 hoses/tubes to the charcoal canister(s) for temporary storage (prior to being drawn into the intake manifold). All models are equipped with a self-diagnosing system using a Leak Detection Pump (LDP) or Natural Vacuum Leak Detection (NVLD). Refer to the Emission Control System for additional information.

INLET CHECK VALVE
All vehicles have an inlet check valve on the inside of the fuel tank at the filler inlet

The valve prevents fuel from splashing back on customer during vehicle refueling. The valve is a non-serviceable item.