One-Way Check Valve (Millenia)
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 Mazda Protege5, 2002 Mazda Protege, 2002 Mazda Millenia, 2002 Mazda MX-5 Miata, and 2002 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
One-way check valve is located on top of fuel tank. Note direction of valve installation. Remove check valve. Apply air pressure to one-way 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 one-way check valve.