John Deere 1075 – ECU: Low Pressure Fuel Pump Data

The Engine Control Unit (ECU) has detected an issue related to the low-pressure fuel pump (also known as the lift or transfer pump) data. Depending on the accompanying FMI code, this indicates electrical, communication, or performance issues within the low-pressure fuel system, such as erratic data, supply voltage problems, loss of CAN bus communication, control or component failure, high temperature, or low fuel pressure.

• PowerTech 4.5L Engine
• PowerTech 6.8L Engine
• 8R Series Tractors
• 8130
• 8230
• 8330
• 8430
• 8530
• 9RT Series Track Tractors
• 624K Wheel Loaders

1. 1

   Check the fuel tank to ensure it contains sufficient, fresh, and uncontaminated diesel fuel.

2. 2

   Inspect primary and secondary fuel filters for clogs (especially if FMI 17 Low Fuel Pressure is present, as this is the most common cause).

3. 3

   Inspect the suction side of the fuel system, fuel lines, connections, and the water separator bowl for air leaks, cracks, or damage.

4. 4

   Perform basic electrical checks: turn the key to the 'on' position without starting the engine and listen for a humming sound from the pump. If there is no sound, check the fuel pump's fuse and relay.

5. 5

   Use a multimeter to verify that voltage is present at the fuel pump's electrical connector.

6. 6

   For voltage or communication codes (FMI 03, 04, 09), inspect the wiring harness and connectors between the ECU and the fuel pump for visible damage, corrosion, or loose pins.

1. 1

   Replace fuel filters

   If filters are found to be clogged or if FMI 17 is logged, replace both the primary and secondary fuel filters with new OEM-spec filters.

2. 2

   Repair air leaks

   If an air leak is identified, tighten loose connections or replace cracked fuel lines and faulty seals. Bleed the fuel system according to the operator's manual to remove all trapped air.

3. 3

   Replace low-pressure fuel pump

   If diagnostics confirm the fuel pump has failed mechanically or electrically: disconnect the negative battery terminal, clean the area, disconnect fuel lines and electrical connector, and remove the old pump. Install the new pump ensuring all seals and gaskets are correctly seated. Reconnect lines and battery, prime the new pump, bleed the system, and start the engine to check for leaks.