Evaporative Check Valve: Testing and Inspection

WARNING: DO NOT SUCK air through 2-way check valve. Fuel vapor inside the valve is harmful.

Two-way Check Valve:

1. Blow hard from fuel tank side (black side of check valve), and air should pass through valve smoothly and come out from its orange side.

2. Blow only softly from orange side, and air should come out from black side.

3. If air doesn't pass through valve in step 1 or hard blow is required in step 2, replace 2-way check valve.