1. Perform the 'Fuel Line Safety Procedure' referring to the BEFORE SERVICE PRECAUTION. (See BEFORE SERVICE PRECAUTION [L3].)
2. Disconnect the negative battery cable.
3. Remove the fuel tank. (See FUEL TANK REMOVAL/INSTALLATION [L3].)
4. Remove the residual fuel.
5. Install the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [L3].)
6. Plug the fuel pipe, breather pipe and port C of the fuel pump unit.
7. Place the fuel tank in a level position.
8. Blow through port B and verify that there is airflow from port A.
9. Turn the fuel tank upside-down. Blow through port B and verify that there is no airflow from port A.