John Deere ECU001075.05 – ECU: Electric Lift Pump In Fuel Filter Base Short/Open

The Engine Control Unit (ECU) has detected an abnormal electrical reading from the electric lift pump circuit located in the fuel filter base. This indicates either a short circuit (an unintended path for current, such as a short to ground or another wire) or an open circuit (a break in the wiring or within the pump's motor). Either condition prevents the lift pump from operating correctly, leading to a loss of fuel pressure to the main injection pump.

• 3800
• 5085M
• 5095M
• 6003
• 6400
• 6403
• 7005
• 7010
• 7210
• 7405
• 7410
• 7510
• 7610
• 7710
• PowerTech 4.5L
• PowerTech 6.8L
• backhoes
• combines
• cotton pickers
• crawlers
• excavators
• feller bunchers
• forklifts
• forwarders
• graders
• log loaders
• log skidders

1. 1

   Check Fuel Filters: A clogged fuel filter is a common cause of fuel delivery problems and can put a strain on the lift pump. It is recommended to change the fuel filters first.

2. 2

   Inspect Wiring and Connectors: Visually inspect the wiring harness leading to the electric lift pump for any signs of damage, such as chafing, cuts, or corrosion. Ensure the electrical connector at the pump is secure and the terminals are clean.

3. 3

   Check for Power at the Pump: Using a multimeter, verify that the lift pump is receiving the correct voltage when the ignition is turned on. The pump should prime for a few seconds when the key is in the 'ON' position. If there is no voltage, the issue may be with a fuse, relay, or the wiring from the ECU.

4. 4

   Listen for Pump Operation: When the ignition is first turned on, you should be able to hear the electric lift pump run for a few seconds to prime the system. If the pump is silent, and it is receiving power, the pump motor has likely failed.

5. 5

   Inspect Fuel Lines: Check for any cracks, leaks, or kinks in the fuel lines that could be restricting fuel flow or introducing air into the system.

6. 6

   Check for Air in the System: Air leaks in the fuel lines or connections can cause the lift pump to lose its prime. Using a clear hose can help to visually inspect for air bubbles in the fuel.

1. 1

   Prepare machine and relieve pressure

   Work in a well-ventilated area and disconnect the battery to prevent accidental sparks. Relieve any pressure in the fuel system by opening the drain valve on the fuel filter/water separator.

2. 2

   Clean the area

   Thoroughly clean the area around the fuel filter base and lift pump to prevent contaminants from entering the fuel system.

3. 3

   Disconnect lines and wiring

   Disconnect the electrical connector from the old pump. Place a catch pan under the pump to collect any spilled fuel, then carefully disconnect the inlet and outlet fuel lines. It is advisable to cap the lines immediately to prevent contamination.

4. 4

   Remove the faulty pump

   Unbolt the old lift pump from its mounting bracket and remove it from the machine.

5. 5

   Install the new pump

   Install the new lift pump in the reverse order of removal. Use new gaskets or O-rings on the fuel line connections to ensure a proper seal.

6. 6

   Reconnect components

   Securely reconnect the fuel lines and the electrical connector to the new pump.

7. 7

   Prime the fuel system

   Turn the ignition key to the 'ON' position for at least 60 seconds to allow the new pump to prime the fuel system. Do not crank the engine immediately. Listen for the pump to run.

8. 8

   Test and check for leaks

   Start the engine and let it run at a fast idle for a couple of minutes. Carefully inspect the pump and all connections for any fuel leaks.