What is SPN 3251 FMI 16 CUMMINS & How to Solve It?

What is SPN 3251 FMI 16 CUMMINS:

SPN 3251 FMI 16 in Cummins engines refers to a high voltage condition in the Fuel Pressure Sensor Circuit. This fault indicates that the ECM is receiving a voltage signal from the fuel pressure sensor that is higher than expected, which can cause inaccurate fuel pressure readings and lead to improper fuel injection timing, engine stalling, or poor performance.

‍

Why This Happens:

• Faulty fuel pressure sensor.
  
• Shorted or damaged wiring in the sensor circuit.
  
• High voltage supply affecting the sensor.
  
• Corroded or loose sensor connectors.
  
• ECM failure to interpret the sensor’s signal correctly.
  
  

How to Fix It:

1. Inspect the fuel pressure sensor and wiring for visible damage or malfunction.
   
2. Test the sensor’s voltage and resistance to verify it is functioning within manufacturer specifications.
   
3. Check the wiring and connectors for damage, corrosion, or loose connections.
   
4. Replace the faulty fuel pressure sensor if necessary.
   
5. Inspect the fuel system for low fuel pressure or pump issues.
   
   

How to Avoid It Before It Happens:

• Regularly inspect the fuel pressure sensor and wiring.
  
• Keep connectors clean and free from corrosion.
  
• Perform routine fuel system maintenance to ensure proper fuel pressure.
  
• Use diagnostic tools to monitor sensor health and performance.
  
• Clue’s Fuel Management services proactively monitor fuel pressure systems to prevent malfunction and engine inefficiency.