2021 Mazda CX-3 AWDFACTORY OEM SERVICE PROCEDURE

Fuel Tank Inspection: 2WD

  1. Level the vehicle.
  2. Complete the "BEFORE SERVICE PRECAUTION". (See BEFORE SERVICE PRECAUTION .)
  3. Drain the fuel. (See FUEL DRAINING PROCEDURE .)
  4. Remove the fuel tank and fuel pump unit as a single unit. (See FUEL TANK REMOVAL/INSTALLATION )
  5. Perform the following procedure to verify fuel tank airtightness.
    1. Plug the fuel pump unit pipe, and ports B and C.

      U.S.A. and CANADA specs  .

      G11436948Courtesy of MAZDA MOTORS CORP.

      Except U.S.A. and CANADA specs  .

      G11436949Courtesy of MAZDA MOTORS CORP.
    2. Apply pressure of 5.9 kPa {44 mmHg, 1.7 inHg} to port A and wait for a while.
    3. Verify that there is no change in the pressure and no air leakage from the fuel tank.
  6. Remove the port C plug.

    U.S.A. and CANADA specs  .

    G11436950Courtesy of MAZDA MOTORS CORP.

    Except U.S.A. and CANADA specs  .

    G11436951Courtesy of MAZDA MOTORS CORP.
  7. Place the fuel tank in a level position.
  8. Close port A and apply 5.9 kPa {44 mmHg, 1.7 inHg} of pressure to port C, and leave it in this condition momentarily.
  9. Open port A and verify that the pressure decreases from 5.9 kPa {44 mmHg, 1.7 inHg}.
  10. Close port A and apply -2.0 kPa {-15 mmHg, -0.59 inHg} vacuum to port C, and leave it in this condition momentarily.
  11. Open port A and verify that the -2.0 kPa {-15 mmHg, -0.59 inHg} negative pressure condition restores to near positive pressure.
  12. Turn the fuel tank upside down.
  13. Apply pressure of 5.9 kPa {44 mmHg, 1.7 inHg} to port A and wait for a while.

    U.S.A. and CANADA specs  .

    G11436952Courtesy of MAZDA MOTORS CORP.

    Except U.S.A. and CANADA specs  .

    G11436953Courtesy of MAZDA MOTORS CORP.
  14. Verify that there is no change in the pressure and no air leakage from the port C.
Factory Service Tools

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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.

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