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
NOTE: If the fuel tank is full, drain the fuel.
1. Remove the fuel tank unit.
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 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, 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.
- If the vacuum does not hold, the transfer fuel pump pump and transfer tube are OK.