SPN 97 FMI 16 — Water in Fuel — Detected
What it means: The water-in-fuel sensor in the fuel/water separator has tripped.
How serious / can you keep driving: Caution. Limp to the next safe stop.
Check first: Drain the fuel/water separator bowl — that's the first and usually the fixing step.
Don't risk it — look up listed providers near you and give them this SPN/FMI when you call.
Listed providers nearest Louisville, KY
Closest first. Tell them SPN 97 FMI 16 and what the truck is doing. RoadService.app lists these providers and does not employ them or carry out the repair.
- 0.0 mi away — based in Louisville, KY · (502) 773-1159
- 0.0 mi away — based in Louisville, KY · (502) 447-1234
- 0.0 mi away — based in Louisville, KY · (502) 648-6725
What SPN 97 FMI 16 means
The water-in-fuel sensor in the fuel/water separator has tripped. Water in diesel can damage injectors and the high-pressure pump, so address it before it becomes an expensive fuel-system failure.
How serious is it?
Caution. Limp to the next safe stop.
Most likely causes
- Water collected in the fuel/water separator bowl (needs draining)
- Contaminated fuel from a bad fill
- Condensation in a low/empty tank
- Faulty water-in-fuel sensor (verify after draining)
First moves (roadside)
- Drain the fuel/water separator bowl — that's the first and usually the fixing step.
- If it refills with water quickly, suspect a contaminated tank/bad fuel.
- Replace the fuel filter if water has carried through.
- If the bowl is dry but the code stays, suspect the sensor.
Common misdiagnoses
- Ignoring the warning and running water through the injectors and pump.
- Replacing the sensor without first draining the separator.
- Missing a contaminated tank that keeps refilling the separator with water.
FAQ
The water-in-fuel sensor in the fuel/water separator has tripped. Water in diesel can damage injectors and the high-pressure pump, so address it before it becomes an expensive fuel-system failure.
Caution — Limp to the next safe stop.
The most common cause is: Water collected in the fuel/water separator bowl (needs draining). Other possibilities include Contaminated fuel from a bad fill; Condensation in a low/empty tank; Faulty water-in-fuel sensor (verify after draining).
Limp to the next safe stop. When in doubt, get a qualified mobile diesel tech on the truck before continuing.
Related codes
Codes that commonly appear alongside SPN 97 FMI 16, or share the same subsystem.
- Injector Metering Rail 1 Pressure - Data Valid But Below Normal Operating Range (XPI common rail fuel pressure too low) (SPN 157 FMI 1)
- Fuel Delivery Pressure — Low (SPN 94 FMI 1)
- Injection Rail Pressure — Below Normal (SPN 157 FMI 18)
- Injector Metering Rail 1 Pressure - Data Valid But Above Normal Operating Range (XPI common rail fuel pressure too high) (SPN 157 FMI 0)
- Injector #1 open circuit (SPN 651 FMI 5)
- Injector #2 open circuit (SPN 652 FMI 5)
- Injector #3 open circuit (SPN 653 FMI 5)
- Injector #4 open circuit (SPN 654 FMI 5)
Same symptom: Fuel delivery
Other codes on the tank-to-injector path — pressure, filters, water and the pump.
- Fuel System Leak Detected - Large Leak (P0093) · Fuel System
- HP Fuel Rail Pressure Low During Power Enrichment (P1093) · Fuel System
- High-Pressure Fuel System Relief Valve Open (P2BAD) · Fuel System
- Injector #5 open circuit (SPN 655 FMI 5) · Fuel System
- Injector #6 open circuit (SPN 656 FMI 5) · Fuel System
- Fuel Rail/System Pressure Too Low (P0087) · Fuel System
Find a mechanic or related guides
General diagnostic guidance for heavy-duty diesel engines (Cummins, Detroit, PACCAR, Volvo, Mack). Not a substitute for a scan-tool diagnosis on your specific truck.