What is SPN 3510 FMI 4 CUMMINS & How to Solve It?

What is SPN 3510 FMI 4:

SPN 3510 FMI 4 in Cummins engines refers to a low voltage condition in the Fuel Pressure Sensor Circuit. FMI 4 indicates that the ECM is receiving an incorrect or low voltage signal from the fuel pressure sensor, which can affect fuel pressure control, leading to engine performance issues such as poor acceleration or stalling.

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Why This Happens:

• Faulty fuel pressure sensor.
  
• Shorted or damaged wiring in the fuel pressure sensor circuit.
  
• Loose or corroded connectors.
  
• Low fuel pressure due to a malfunctioning fuel pump.
  
• ECM misinterpreting the sensor’s signal.
  
  

How to Fix It:

1. Inspect the fuel pressure sensor for visible damage or malfunction.
   
2. Test the sensor’s voltage and resistance to verify it’s within specifications.
   
3. Check wiring and connectors for damage or corrosion.
   
4. Replace the faulty fuel pressure sensor if necessary.
   
5. Ensure proper fuel pressure and verify the fuel pump is functioning correctly.
   
   

How to Avoid It Before It Happens:

• Regularly inspect the fuel pressure sensor and its wiring.
  
• Perform routine checks on the fuel system to ensure fuel pressure is stable.
  
• Keep connectors clean and corrosion-free.
  
• Perform diagnostic checks to monitor sensor performance.
  
• Clue’s Fuel Management services help track fuel system performance, preventing issues from affecting engine operation.