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.

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.
Remove the fuel tank. (See FUEL TANK REMOVAL/INSTALLATION ).
Level the fuel tank.
Perform the following procedure to verify the fuel tank airtightness.
1. Plug the fuel pump unit pipe, ports B and C.
  California emission regulation applicable model
  
  Fig 1: Identifying Fuel Tank Unit Pipe (California Emissions Regulation Applicable Model)
  Courtesy of MAZDA MOTORS CORP.
  
  Except for California emission regulation applicable model
2. Apply a pressure to port A and wait for a while.
3. Verify that there is no air leakage from the fuel tank.
  - If there is no airflow, replace the fuel tank.
Apply a pressure to port A and wait for a while.

Fig 2: Identifying Fuel Tank Unit Pipe (Except For California Emission Regulation Applicable Model)
Courtesy of MAZDA MOTORS CORP.

California emission regulation applicable model

Fig 3: Identifying Fuel Tank Unit Pipe Ports (California Emissions Regulation Applicable Model)
Courtesy of MAZDA MOTORS CORP.

Except for California emission regulation applicable model
With the pressure still applied, verify that there is airflow from port B and C.
- If there is no airflow from either port, replace the fuel tank.
Place the fuel tank upside down.
Apply a pressure to port A and wait for a while.

Fig 4: Identifying Fuel Tank Unit Pipe Ports (Except For California Emission Regulation Applicable Model)
Courtesy of MAZDA MOTORS CORP.

California emission regulation applicable model

Fig 5: Identifying Fuel Tank Unit Pipe Ports (California Emissions Regulation Applicable Model)
Courtesy of MAZDA MOTORS CORP.

Except for California emission regulation applicable model
With the pressure still applied, verify that there is no airflow from port B and C.
- If there is airflow from either port, replace the fuel tank.
  
  Fig 6: Identifying Fuel Tank Unit Pipe Ports (Except For California Emission Regulation Applicable Model)
  Courtesy of MAZDA MOTORS CORP.