Fuel Pump: Testing and Inspection
Transfer Fuel Pump TestSpecial Tools Required
Vacuum pump/gauge, 0-30 in.Hg, Snap-on YA4000A or equivalent, commercially available
1. Remove the secondary fuel gauge sending unit.
2. Connect the vacuum pump/gauge 0-30 in.Hg to the transfer tube (A).
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.
8. Remove the fuel tank unit.
9. Connect the vacuum pump/gauge 0-30 in.Hg to the fuel tank unit.
10. Lower the fuel tank unit (A) into the fuel tank until the pick up screen is submerged in the fuel.
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, then recheck the fuel vacuum.