Check & Cut Valve: 626

Remove check valve. Blow through the check valve from port A and make sure that the air comes out of port B. Next, block the port B. Air should come out of port C. Block port B, and suck through port A. If the air comes through from the port C, the valve is functioning properly. See Fig 1 .

Fig 1: Testing Check Valve (626) Check valve is located next to fuel tank.