NONRETURN Valve Inspection

WARNING: This page is about a different car, the 2004 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

Remove the fuel-filler pipe. (See FUEL TANK REMOVAL/INSTALLATION .)
Move the valve and verify that the valve opens to 90°.
- If it does not open, replace the fuel-filler pipe.
Verify that the nonreturn valve returns to the normal position by spring force.
- If it does not return, replace the fuel-filler pipe.
  
  Fig 1: Inspecting Nonreturn Valve
  Courtesy of MAZDA MOTORS CORP.