Fuel Pump: Testing and Inspection

Transfer Fuel Pump Test

Special Tools Required

- Vacuum pump/gauge, 0-30 in.Hg, Snap-on YA4000A or equivalent, commercially available
NOTE: If the fuel tank is full, drain the fuel. Service and Repair

1. Remove the fuel tank unit. Fuel Tank Unit Removal and Installation

2. Disconnect the transfer tube (A), then connect a vacuum pump/gauge, 0-30 in.Hg, to the fuel tank unit.






3. Connect the fuel pump 5P connector.

4. Lower the fuel tank unit (A) into the fuel tank until the pick up screen is submerged in the fuel.

5. Turn the ignition switch to ON (II).

6. From the INSPECTION MENU of the HDS, select Fuel Pump ON.

7. 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, go to step 8.

- If the vacuum is out of specification, replace the fuel tank unit, Fuel Tank Unit Removal and Installation then recheck the fuel vacuum.





8. Connect a vacuum pump/gauge, 0-30 in.Hg, to the transfer tube.

9. Apply vacuum to the transfer tube.
- If the vacuum holds, replace the fuel tank. Service and Repair

- If the vacuum does not hold, the transfer fuel pump and the transfer tube are OK.