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HOMESERVICE MANUALSMAZDA1999626 ES, 2.5 D, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 396 (FUEL SYSTEM)FUEL TANK INSPECTIONOBD II REGULATION VEHICLE
1999 Mazda 626 ES, 2.5 D, Standard

OBD II Regulation Vehicle

1999 Mazda 626 ES, 2.5 D, StandardSECTION 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 fuel shut-off valve and two rollover valves integrated in the fuel tank.
  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 of the fuel pump unit.
  4. Plug port C.
  5. Level the fuel tank.
    Fig 1: Identifying Fuel Pump Unit Components (OBD II Regulation Vehicle) (1 Of 2)
    G03699869Courtesy of MAZDA MOTORS CORP.
  6. Blow through port B and verify that there is airflow from port A.
    • If there is no airflow, replace the fuel tank.
    • If there is airflow, turn the fuel tank upside-down, and proceed to next step.
  7. Blow through port B and verify that there is no airflow from port A.
    • If there is airflow, replace the fuel tank.
    Fig 2: Identifying Fuel Pump Unit Components (OBD II Regulation Vehicle) (2 Of 2)
    G03699870Courtesy of MAZDA MOTORS CORP.
RENDER: 1.0x

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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.