NONRETURN Valve Inspection

WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Remove the nonreturn valve. (See FUEL TANK REMOVAL/INSTALLATION .)
Verify that the nonreturn 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 nonreturn valve does not open up to 90° or does not return to the normal position, replace the nonreturn valve.
  
  Fig 1: Identifying Nonreturn Valve Position
  Courtesy of MAZDA MOTORS CORP.