Non-OBD II Regulation Vehicle

NOTE:

This inspection is for two rollover valves integrated in the fuel tank. The evaporative gas check valve (two-way) is integrated with each rollover valve.

Disconnect the plastic fuel hose and the fuel pump unit connector. (See FUEL PUMP UNIT REMOVAL/INSTALLATION .)
Remove the fuel tank with the fuel pump unit. (See FUEL TANK REMOVAL/INSTALLATION .)
Plug the fuel main pipe and fuel return pipe of the fuel pump unit.
Level the fuel tank.
Blow through port A.
1. Plug port B and verify that there is airflow from port C.
2. Plug port C and verify that there is airflow from port B.
  - If there is no airflow, replace the fuel tank.
  - If there is airflow, turn the fuel tank upside-down and proceed to the next step.
Fig 1: Identifying Fuel Pump Unit Components (Non-OBD II Regulation Vehicle) (1 Of 2)
Courtesy of MAZDA MOTORS CORP.
Blow through port A.
1. Plug port C and verify that there is no airflow from port B.
  - If there is airflow, replace the fuel tank.
2. Plug port B and verify that there is airflow from port C.
  - If there is no airflow, replace the fuel tank.
Fig 2: Identifying Fuel Pump Unit Components (Non-OBD II Regulation Vehicle) (2 Of 2)
Courtesy of MAZDA MOTORS CORP.