Fuel Pump: Testing and Inspection

FUEL TANK PUMP OPERATION CHECK

Required Special Tools:

MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

1. Remove the fuel tank cap.

2. Using scan tool MB991958, forcibly drive the fuel tank pump (integrated in the fuel pump module) to check the fuel tank pump operation.
NOTE:
The operating sound of the fuel tank pump is difficult to be heard because the pump is in-tank type. Therefore, remove the fuel tank cap to check the sound from the fuel filler port.





















3. If the fuel tank pump does not operate, follow the procedure below to check the pump for operation. If it is normal, check the driving circuit.
(1) Turn the ignition switch to the "LOCK" (OFF) position.
(2) Remove the rear seat cushion assembly Rear Seat Assembly Removal and Installation).
(3) Remove the floor inspection lid (LH).
(4) Disconnect the fuel pump module connector.
(5) When the battery is connected to the fuel pump module connector terminals number 4 and 5 (fuel pump module side), check that the pump operating sound can be heard. When the pump operating sound cannot be heard, replace the fuel pump assembly Overhaul).
NOTE:
The operating sound of the fuel tank pump is difficult to be heard because the pump is in-tank type. Therefore, remove the fuel tank cap to check the sound from the fuel filler port.

(6) Install the fuel tank cap.
(7) Connect the fuel pump module connector.
(8) Install the floor inspection lid (LH).
(9) Install the rear seat cushion assembly Rear Seat Assembly Removal and Installation).