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Fuel Tank Inspection

NOTE:
  • The rollover valve and the fuel shut-off valve built into the fuel tank and fuel tank leakage are inspected in this inspection.
  1. Complete the "BEFORE SERVICE PRECAUTION". (See BEFORE SERVICE PRECAUTION .)
  2. Remove the battery cover. (See BATTERY REMOVAL/INSTALLATION .)
  3. Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION .)
  4. Remove the fuel tank and the fuel pump unit as a single unit. (See FUEL TANK REMOVAL/INSTALLATION .)
  5. Perform the following procedure to verify the fuel tank airtightness.
    1. Plug the fuel pump unit pipe, ports B and C.
      G13726731Courtesy of MAZDA MOTORS CORP.
    2. Apply a pressure of 3 kPa {23 mmHg, 0.9 inHg} to port A and wait for a while.
    3. Verify that there is no air flow leakage from the fuel tank.
  6. Plug the fuel pump unit pipe and port C.
    G13726732Courtesy of MAZDA MOTORS CORP.
  7. Level the fuel tank.
  8. Apply a pressure of 3 kPa {23 mmHg, 0.9 inHg} to port A and wait for a while.
  9. With the pressure still applied, verify that there is air flow port B and the pressure is 0-3 kPa {0-23 mmHg, 0-0.9 inHg}.
  10. Apply a pressure of -0.5 kPa {-3.8 mmHg, -0.1 inHg} to port A and wait for a while.
  11. With the pressure still applied, verify that there is air flow port B and the pressure is -0.5-0 kPa {-3.8-0 mmHg, -0.1-0 inHg}.
  12. Apply a pressure to port A and wait for a while.
    G13726733Courtesy of MAZDA MOTORS CORP.
  13. With the pressure still applied, verify that there is no air flow from port B.
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