Fuel Grade Vent Valve Assembly

The fuel grade vent valve assembly is mounted on the top of the fuel tank and cannot be serviced separately. If service is necessary a new fuel tank must be installed. It is used to control the flow of fuel vapors entering the EVAP system. 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 float will lift as the fluid level rises 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 roll over condition, the weight of the open bottom float and spring pressure will close the orifice.