Overfill Limiter (Two-Way Valve)

Overfill Limiter (Two-way Valve) Operation:

1. Remove the overfill limiter mounting bolt.
2. Disconnect the vapor hoses, and then remove the over fill limiter.
3. Blow lightly into the inlet and the outlet. If air passes through after a slight resistance, then the valve is good.

Or use a hand vacuum pump to test the two way valve:

Connected to inlet side : Maintains vacuum
Connected to outlet side: Does not hold vacuum

4. If above conditions are not met replace the valve