What is SPN 97 FMI 16 (Cummins) & How to Solve It?

What is SPN 97 FMI 16:

SPN 97 refers to Water-in-Fuel Detection, and FMI 16 means the data is valid but above normal range — indicating high water content in the fuel.

This can cause injector damage, poor performance, or hard starting if not drained.

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Why This Happens

• Water collecting in fuel filter bowl.
• Faulty or saturated water separator sensor.
• Using contaminated or poor-quality fuel.
• High humidity and condensation in tank.

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How to Fix It

1. Drain the water separator.
2. Replace the fuel filter if saturated.
3. Inspect fuel tank for signs of contamination.
4. Replace sensor if water is removed but code persists.
5. Clear the code and monitor for repeat faults.

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How to Avoid It Before It Happens

1. Drain water separators daily in wet or humid conditions.
2. Refill from clean, sealed fuel sources only.
3. Use biocide additives in stored fuel.
4. Replace sensors proactively after 1,000 hours.