Transfer Fuel Pump Test

Special Tools Required 

Vacuum pump/gauge, 0-30 in.Hg, Snap-on YA4000A or equivalent, commercially available

1. Remove the secondary fuel gauge sending unit (see SECONDARY FUEL GAUGE SENDING UNIT REMOVAL/INSTALLATION ).
2. Connect the vacuum pump/gauge 0-30 in.Hg to the transfer tube (A).
   Fig 1: Identifying Transfer Tube

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
3. Turn the ignition switch ON (II).
4. From the INSPECTION MENU of the HDS, select Fuel Pump ON.
5. Read the vacuum pump/gauge 0-30 in.Hg. The vacuum should be 4.0 kPa (1.2 in.Hg, 30 mmHg).
   • If the vacuum is OK, the transfer fuel pump and transfer tube is OK.
   • If the vacuum is out of specification, go to step  6.
6. Turn the ignition switch OFF.
7. Install the secondary fuel gauge sending unit (see INSTALLATION ).
8. Remove the fuel tank unit (see FUEL TANK UNIT REMOVAL AND INSTALLATION ).
9. Connect the vacuum pump/gauge 0-30 in.Hg to the fuel tank unit.
   Fig 2: Connecting Vacuum Pump/Gauge To Fuel Tank Unit

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
10. Lower the fuel tank unit (A) into the fuel tank until the pick up screen is submerged in the fuel.
    Fig 3: Identifying Fuel Tank Unit

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
11. Connect the fuel tank unit 4P connector.
12. Turn the ignition switch ON (II).
13. From INSPECTION MENU of the HDS, select Fuel Pump ON.
14. Read the vacuum pump/gauge 0-30 in.Hg. The vacuum should be 4.0 kPa (1.2 in.Hg, 30 mmHg).

• If the vacuum is OK, replace the transfer tube, then recheck the fuel vacuum.
• If the vacuum is out of specification, replace the fuel tank unit (see FUEL TANK UNIT REMOVAL AND INSTALLATION ), then recheck the fuel vacuum.