Fuel Tank Inspection

NOTE:

The rollover valves built into the fuel tank and fuel shut-off valve also built into the fuel tank are inspected in this inspection.

Follow "BEFORE SERVICE PRECAUTION" before performing any work operations to prevent fuel from spilling from the fuel system. (See BEFORE SERVICE PRECAUTION ).
Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [L3] ).
Remove the fuel tank. (See FUEL TANK REMOVAL/INSTALLATION ).
Perform the following procedure to verify the fuel tank airtightness.
1. Plug the fuel pump unit pipe, ports B.
2. Apply a pressure of 3 kPa {23 mm Hg, 0.9 in Hg} to port A and wait for a while.
3. Verify that there is no air leakage from the fuel tank.
Plug the fuel pump unit pipe and port C.
Level the fuel tank.

Fig 1: Inspecting Fuel Tank (1 Of 3)
Courtesy of MAZDA MOTORS CORP.
Apply a pressure of 3 kPa {23 mm Hg, 0.9 in Hg} to port A and wait for a while.
With the pressure still applied, verify that there is airflow from port B and the pressure is 0-3 kPa {0-22 mmHg, 0-0.8 inHg}.
- If there is no airflow, replace the fuel tank.
Apply a pressure of -0.5 kPa {-3.8 mmHg, -0.1 inHg} to port A and wait for a while.
With the pressure still applied, verify that there is airflow from port B and the pressure is -0.5-0 kPa {-3.8-0 mmHg, -0.2-0 inHg}.
- If there is no airflow, replace the fuel tank.
- If there is airflow, place the fuel tank upside down.
  
  Fig 2: Inspecting Fuel Tank (2 Of 3)
  Courtesy of MAZDA MOTORS CORP.
Apply a pressure of 3 kPa {23 mmHg, 0.9 inHg} to port A and wait for a while.
With the pressure still applied, verify that there is no airflow from port B.
- If there is airflow, replace the fuel tank.
  
  Fig 3: Inspecting Fuel Tank (3 Of 3)
  Courtesy of MAZDA MOTORS CORP.