Fuel Tank Check Valve: Operation

The fuel tank check valve (also referred to as either a control valve, one-way check valve or float valve) will prevent fuel flow through the fuel tank vent in the event of an accidental vehicle rollover. It is also used as a part of the ORVR system. The EVAP canister and ORVR system draw fuel vapors from the fuel tank through this valve. Refer to ORVR in Emissions for additional information.

The valve may be serviced by replacing the upper section of the fuel pump module assembly.