Montero Sport XLS 4WD V6-3.0L SOHC (1999)
Fuel Tank Filler Tube: Testing and Inspection
FUEL TANK FILLER TUBE CHECK
1. Connect a clean rubber hose to port A of the fuel tank filler tube.
2. Blow air into the hose. Check that the air flows out of port B.
3. Use a screwdriver or similar tool to close the valve, then blow air into the hose. Check that the air does not flow out of port B.