Fuel Check Valve: Description

The fuel check valve is used to prevent fuel leaks if the car suddenly rolls over. This valve is connected in the fuel vapor line (between the EVAP Canister and the overfill limiter) and is installed on the fuel tank The fuel check valve contains two balls as shown in the illustration. Under normal conditions, the gasoline vapor passage in the valve is opened, but if a roll-over occurs, one of the balls closes the fuel passage, thus preventing fuel leaks.