Fuel Tank Inspection: AWD

Level the vehicle.
Complete the "BEFORE SERVICE PRECAUTION". (See BEFORE SERVICE PRECAUTION ).
Drain the fuel. (See FUEL DRAINING PROCEDURE ).
Using the following procedure:
6:4 split type
1. Remove the rear seat cushion. (See REAR SEAT CUSHION REMOVAL/INSTALLATION ).
4:2:4 split type
1. Set the rear seat aside as shown in the figure. (See REAR SEAT REMOVAL/INSTALLATION ).
Main side

Fig 1: Positioning Rear Seat (AWD Main Side)

Sub side
Partially peel back the floor mat as shown in the figure.

Fig 2: Positioning Rear Seat (Sub Side)

Main side

Fig 3: Identifying Floor Mat (Main Side)

Sub side
Remove the service hole cover.

Fig 4: Identifying Floor Mat (Sub Side)

Main side

Fig 5: Identifying Service Hole Cover And Screws (Main Side)

Sub side
Disconnect the following parts:
Main side
- Fuel pump unit connector
- Quick release connector (See QUICK RELEASE CONNECTOR REMOVAL/INSTALLATION )
Sub side
- Fuel gauge sender unit (sub) connector
Remove the floor under cover. (See FLOOR UNDER COVER REMOVAL/INSTALLATION ).
Disconnect the HO2S connector.
Remove the TWC and HO2S as a single unit. (See EXHAUST SYSTEM REMOVAL/INSTALLATION )
Remove the propeller shaft. (See PROPELLER SHAFT REMOVAL/INSTALLATION ).
Remove the fuel tank, fuel pump unit and fuel gauge sender unit (sub) as a single unit. (See FUEL TANK REMOVAL/INSTALLATION )
Perform the following procedure to verify the fuel tank airtightness.

Fig 6: Identifying Service Hole Cover And Screws (Sub Side)
1. Plug the fuel pump unit pipe, ports B and C.
2. Apply a pressure of 3 kPa {23 mmHg, 0.9 inHg} to port A and wait for a while.
3. Verify that there is no air flow leakage from the fuel tank.
  - If there is air flow, replace the fuel tank. (See FUEL TANK REMOVAL/INSTALLATION ).
    
    Fig 7: Identifying Fuel Pump Unit Pipe Plugs And Ports B And C
Plug the fuel pump unit pipe and port B.
Level the fuel tank.
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 air flow from port C and the pressure is 0-3 kPa {0-23 mmHg, 0-0.9 inHg}.
- If there is no air flow, replace the fuel tank. (See FUEL TANK REMOVAL/INSTALLATION ).
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 air flow from port C and the pressure is -0.5-0 kPa {-3.8-0 mmHg, -0.1-0 inHg}.
- If there is no air flow, replace the fuel tank. f (See FUEL TANK REMOVAL/INSTALLATION ).
- If there is air flow, place the fuel tank upside down.
  
  Fig 8: Identifying Fuel Pump Unit Pipe Plug And Port B
Apply a pressure to port A and wait for a while.
With the pressure still applied, verify that there is no air flow from port C.
- If there is air flow, replace the fuel tank. (See FUEL TANK REMOVAL/INSTALLATION ).
  
  Fig 9: Identifying Fuel Pump Unit Pipe Plug And Port A And C