Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSMAZDA20086 S SPORT, 4D HATCHBACK, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 187 (FUEL SYSTEM)FUEL TANK INSPECTIONOBD II REGULATION VEHICLE

2008 Mazda 6 s Sport, 4D Hatchback, Standard

OBD II Regulation Vehicle

2008 Mazda 6 s Sport, 4D Hatchback, StandardSECTION OBD II Regulation Vehicle

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

NOTE:

Inspection is for fuel shut-off valve and two rollover valves integrated in the fuel tank.

Disconnect the plastic fuel hose and the fuel pump unit connector. (See FUEL PUMP UNIT REMOVAL/INSTALLATION .)
Remove the fuel tank with the fuel pump unit. (See FUEL TANK REMOVAL/INSTALLATION .)
Plug the fuel main pipe of the fuel pump unit.
Plug port C.
Level the fuel tank.

Fig 1: Fuel Tank Inspection (OBD II) - 1 Of 2
Courtesy of MAZDA MOTORS CORP.
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.
Blow through port B and verify that there is no airflow from port A.
- If there is airflow, replace the fuel tank.
  
  Fig 2: Fuel Tank Inspection (OBD II) - 2 Of 2
  Courtesy of MAZDA MOTORS CORP.

RENDER: 1.0x

NO RELATED

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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.