Case IH 278 – Engine Controller (ENG): Fuel Lift Pump is failed

Indicates an electrical or operational failure in the electric fuel lift pump circuit, meaning the pump is either unplugged, experiencing an open/short circuit, or has failed internally.

• MX Magnum
• STX Steiger
• MX240
• MX255
• MX270
• MX285
• STX440
• Magnum series
• TG210
• TG230
• TG255
• TG285

1. 1

   Check the Connection: Verify that the electric fuel lift pump is actually plugged in. Running or cranking the tractor with the pump unplugged will immediately trigger Code 278.

2. 2

   Inspect the Wiring Harness: Trace the wiring from the fuel lift pump back to the Engine Controller. Look for chafed wires, corrosion, or an open/short circuit.

3. 3

   Test Pin 11: Test the continuity and voltage at Engine Controller Pin 11 to ensure the relay driver is sending the correct signal to the pump.

1. 1

   Turn off machine and disconnect battery

   Turn off the machine and disconnect the battery to prevent electrical shorts.

2. 2

   Locate fuel lift pump

   Locate the electric fuel lift pump on the engine block.

3. 3

   Disconnect electrical harness

   Disconnect the electrical harness connector from the lift pump.

4. 4

   Disconnect fuel lines

   Disconnect the fuel lines routed to the pump. Have a catch pan ready to collect residual diesel fuel.

5. 5

   Remove mounting bolts

   Remove the three mounting bolts coming in from the top that hold the pump assembly together/to the housing.

6. 6

   Remove old pump

   Remove the old pump and the rubber gasket.

7. 7

   Install new pump

   Install the new fuel lift pump and its new gasket, tightening the three mounting bolts to OEM torque specs.

8. 8

   Reconnect lines and connector

   Reconnect the fuel lines and plug the electrical connector back in.

9. 9

   Prime fuel system and start

   Prime the fuel system if necessary, reconnect the battery, and start the tractor.

10. 10

    Clear fault codes

    Clear the fault codes. On some Magnum/MX displays, this can be done by holding the 'INCR' and 'DECR' keys simultaneously for 10 seconds, though a dealer laptop may be required if the code is hard-stored.