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.
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.