Fuel Limit Vent Valve (FLVV) Assembly

WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.

The fuel limit vent valve (FLVV) assembly is mounted inside the fuel tank and cannot be serviced separately. If service is necessary a new fuel pump and sender assembly must be installed. It is used to control the flow of fuel vapors entering the EVAP system with the primary function of controlling fuel tank liquid fuel volume. The assembly also has a spring float, which prevents liquid fuel from entering the vapor delivery system under severe handling or vehicle rollover conditions. In the upright position, the open bottom of the float will lift and shut off the orifice. Under severe handling conditions, the spring will push the float closed when angles allow liquid fuel to reach the orifice. In a rollover condition, the weight of the open bottom float and spring pressure will close the orifice.