New Holland ENG 3141 – Engine Control Unit (ECU / ECM / EDC): Fuel Metering Unit: Leakage is detected based on fuel quantity balance.

The fuel flow setpoint is too low, or the high-pressure fuel pump is pumping more fuel than expected by the system. The system detects a discrepancy between the commanded fuel quantity and the actual fuel pressure/volume, interpreting it as a leak or an imbalance in the fuel metering circuit.

• T5.95
• T5.105
• T5.115
• T7 series
• T8 series
• T9.670
• L220
• SR175
• B90B
• B100B
• CR9090
• CX8080 Elevation
• CX8090 Elevation

1. 1

   Check the Metering Unit Circuit: Inspect the wiring harness and connectors for the fuel metering unit (M-Prop) for shorts, opens, or loose contacts.

2. 2

   Inspect Low-Pressure Fuel Lines: Check the fuel return tubes (from the pump back to the tank) to ensure they are not clogged or restricted.

3. 3

   Check the Fuel Pressure Sensor: Verify the sensor is reading accurately and not sending erratic data to the ECU.

4. 4

   Check for Leaking Injectors: Perform an injector return flow test to see if injectors are leaking excessive fuel back into the return system.

5. 5

   Inspect the Pressure Relief Valve: Check the pressure relief valve on the fuel rail (often located under the valve cover on larger engines) to ensure it is not stuck open or leaking.

1. 1

   Access the Pump

   On larger tractors, the high-pressure pump is located at the rear right-hand side of the engine. Remove the breather cover on the back and take the breather off the filter to gain access.

2. 2

   Remove the Gear

   Use a specialized puller to remove the gear from the high-pressure fuel pump. Note: These specific diesel pumps do not have timing marks, so pump timing is not a factor during reinstallation.

3. 3

   Replace the Component

   Depending on the diagnosis, replace either the standalone Fuel Metering Unit (Quantity Control Valve) on the pump, or the entire High-Pressure Fuel Pump assembly if internal pump wear is found.

4. 4

   Clear Lines and Reassemble

   Ensure all fuel lines are clear of debris. Reinstall the pump gear, breather, and covers.

5. 5

   Prime and Clear Codes

   Prime the fuel system, clear the ENG 3141 fault code via the diagnostic tool, and test run the machine to ensure it no longer enters stall/derate mode.