One-Way Check Valve (Millenia)

One-way check valve is located on top of fuel tank. Note direction of valve installation. Remove check valve. Apply air pressure to check valve port "A". See Fig 1 . Air should flow from port "B". Apply air pressure to port "B". Air should not flow from port "A". If check valve does not operate as specified, replace check valve.

Fig 1: Identifying One-Way Check Valve (Millenia)

Courtesy of MAZDA MOTORS CORP.