Non Return Valve Inspection

WARNING: This page is about a different car, the 2004 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Remove the non return valve. (See FUEL TANK REMOVAL/INSTALLATION .)
Verify that the non return valve opens up to 90° when it is pushed from the fuel-filler pipe side, and it returns to the normal position by the spring force.
- If the non return valve does not open up to 90° or does not return to the normal position, replace the non return valve.
Fig 1: Checking Non Return Valve Movement
Courtesy of MAZDA MOTORS CORP.