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HOMESERVICE MANUALSMAZDA20086 S SPORT, 4D HATCHBACK, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 394 (FUEL SYSTEM)FUEL TANK INSPECTIONNON-OBD II REGULATION VEHICLE
2008 Mazda 6 s Sport, 4D Hatchback, Standard

Non-OBD II Regulation Vehicle

2008 Mazda 6 s Sport, 4D Hatchback, StandardSECTION Non-OBD II Regulation Vehicle
WARNING: This page is about a different car, the 2005 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • This inspection is for two rollover valves integrated in the fuel tank. The evaporative gas check valve (two-way) is integrated with each rollover valve.
  1. Disconnect the plastic fuel hose and the fuel pump unit connector. (See FUEL PUMP UNIT REMOVAL/INSTALLATION .)
  2. Remove the fuel tank with the fuel pump unit. (See FUEL TANK REMOVAL/INSTALLATION .)
  3. Plug the fuel main pipe and fuel return pipe of the fuel pump unit.
  4. Level the fuel tank.
  5. Blow through port A.
    1. Plug port B and verify that there is airflow from port C.
    2. Plug port C and verify that there is airflow from port B.
      • If there is no airflow, replace the fuel tank.
      • If there is airflow, turn the fuel tank upside-down and proceed to the next step.
    Fig 1: Identifying Fuel Pump Unit Components (Non-OBD II Regulation Vehicle) (1 Of 2)
    G03699871Courtesy of MAZDA MOTORS CORP.
  6. Blow through port A.
    1. Plug port C and verify that there is no airflow from port B.
      • If there is airflow, replace the fuel tank.
    2. Plug port B and verify that there is airflow from port C.
      • If there is no airflow, replace the fuel tank.
    Fig 2: Identifying Fuel Pump Unit Components (Non-OBD II Regulation Vehicle) (2 Of 2)
    G03699872Courtesy of MAZDA MOTORS CORP.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.