John Deere 001075.12 – ECU: Electric Low-Pressure Fuel Pump Fault

The Engine Control Unit (ECU) has detected an electrical anomaly with the electric low-pressure fuel pump (lift pump) circuit. This fault indicates a short circuit, an open circuit (a break in the wiring), or a signal outside the expected range. The lift pump is responsible for drawing fuel from the tank to provide a consistent low-pressure supply to the high-pressure injection pump; a failure here can lead to fuel starvation and engine performance issues.

• 8130
• 8225R
• 8230
• 8230T
• 8245R
• 8270R
• 8295R
• 8295RT
• 8320R
• 8320RT
• 8330
• 8330T
• 8345R
• 8345RT
• 8430
• 8430T
• 8530
• 9230
• 9330
• 9430
• 9530
• 9630
• C670
• S560
• S650
• S660
• S670
• S670HM
• S760
• S770
• T560
• T660
• T670
• W650
• W660
• 9660 STS
• 9670 STS
• 9760 STS
• 9770 STS
• 9780
• 4930
• 7180
• 7250
• 8100
• 8200
• 7660

1. 1

   Check and replace the fuel filters, as clogged filters can strain the pump and lead to low fuel pressure, potentially triggering the fault

2. 2

   Visually inspect the wiring harness and connectors leading to the electric lift pump for chafing, breaks, corrosion, or loose connections

3. 3

   Test for power at the pump using a multimeter to verify it receives the correct voltage when the ignition is turned on (during the priming period) and while cranking

4. 4

   Test the continuity of the wiring between the ECU and the fuel pump connector to rule out an open circuit, and test the power supply wire for a short to ground

5. 5

   Test fuel pump pressure and flow. A healthy pump should deliver a strong, steady stream of fuel. (Note: Pressure specs vary by model, ranging from 3-4.5 psi for some transfer pumps up to 12-24 psi for older models)

1. 1

   Prepare machine for service

   Park the machine on a level surface, turn off the engine, and disconnect the battery to prevent accidental starting or electrical shorts.

2. 2

   Locate and prepare to remove pump

   Locate the electric low-pressure fuel pump on the engine block or integrated into the fuel filter base. Place a drain pan or rags under the pump to catch spilled fuel.

3. 3

   Remove the faulty fuel pump

   Disconnect the electrical connector. Carefully disconnect and cap the inlet and outlet fuel lines to prevent contamination. Remove the mounting bolts securing the pump and bracket, then remove the pump from the engine.

4. 4

   Install the new fuel pump

   Install the replacement pump, ensuring any new O-rings or sealing washers for the fuel line connections are used. Secure the pump with its mounting bolts.

5. 5

   Reconnect and prime the fuel system

   Reconnect the fuel lines and electrical connector, then reconnect the battery. Turn the ignition key to the 'on' position without starting the engine to let the pump run and prime the system. Cycle the key a few times and check for leaks at the connections.

6. 6

   Verify repair

   Start the engine and check for fuel leaks. Clear the fault codes using a diagnostic tool and verify that code 001075.12 does not return.