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Home >> Mazda >> 2014 >> MX-5 Miata Club, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Fuel Delivery >> Fuel System >> Fuel Tank Inspection

Fuel Tank Inspection

NOTE:
  • The two rollover valves built into the fuel tank and check valves (two-way) built into the rollover valves are inspected in this inspection.
  1. Follow "BEFORE SERVICE PRECAUTION" before performing any work operations to prevent fuel from spilling from the fuel system. (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 with the fuel pump unit. (See FUEL TANK REMOVAL/INSTALLATION .)
  5. Perform the following procedure to verify the fuel tank airtightness.
    1. Plug the fuel pump unit pipe, port B and port C.
    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 leakage from the fuel tank.
      Fig 1: Fuel Pump Unit Pipe Plug
      G06150883Courtesy of MAZDA MOTORS CORP.
  6. Plug the fuel pump unit pipe and port B.
  7. Level the fuel tank.
  8. Apply a pressure of 3 kPa {23 mmHg, 0.9 inHg}  to port C and wait for a while.
  9. With the pressure still applied, verify that there is airflow from port A and the pressure is 0-3 kPa {0-22 mmHg, 0-0.8 inHg}  .
  10. Apply a pressure of -0.5 kPa {-3.8 mmHg, -0.1 inHg}  to port C and wait for a while.
  11. With the pressure still applied, verify that there is airflow from port A and the pressure is -0.5-0 kPa {-3.8- 0 mmHg, -0.2-0 inHg}. 
  12. Apply a pressure of 3 kPa {23 mmHg, 0.9 inHg} to port C and wait for a while.
    Fig 2: Locating Port C
    G06150884Courtesy of MAZDA MOTORS CORP.
  13. With the pressure still applied, verify that there is no airflow from port A.
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