Water in fuel light (diesel)
Also called: fuel filter water light
Water has collected in the diesel fuel filter. Drain it soon.
What it means
Diesel fuel filters separate water from the fuel. When enough collects, this light comes on. Water in a modern common-rail diesel can quickly damage the injectors and high-pressure pump.
Green, yellow, red: three ways this can look
Match your situation to the closest example.
Keep an eye on it
It came on after a fill-up. Drain the water separator and the light goes out.
Schedule a repair
It keeps coming back. Change the fuel filters and think about where you're buying fuel.
Stop and get help
It's on with rough running, stalling or loss of power. Stop. Water may already be past the filter.
Common causes
- Water in the fuel from a bad fill-up
- Condensation in the tank
- Full water separator
- Faulty water-in-fuel sensor
What to do right now
- Drain the water separator (see the owner's manual)
- Change fuel filters if it returns
- Stop driving if the engine runs rough
Related guides
Symbols and meanings vary a little by make and model. Your owner's manual has the exact meaning for your vehicle.
Other warning lights
Questions
What does the water in fuel light (diesel) mean?
Water has collected in the diesel fuel filter. Drain it soon. Diesel fuel filters separate water from the fuel. When enough collects, this light comes on. Water in a modern common-rail diesel can quickly damage the injectors and high-pressure pump.
Can I keep driving with the water in fuel light (diesel) on?
Green: It came on after a fill-up. Drain the water separator and the light goes out. Yellow: It keeps coming back. Change the fuel filters and think about where you're buying fuel. Red: It's on with rough running, stalling or loss of power. Stop. Water may already be past the filter.
What causes the water in fuel light (diesel)?
Common causes: water in the fuel from a bad fill-up; condensation in the tank; full water separator; faulty water-in-fuel sensor.
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