* Contaminated Fuel: The most common cause. Water can enter the fuel tank through several avenues:
* Leaking fuel cap: A loose or damaged gas cap allows moisture to enter the tank.
* Condensation: Moisture can condense inside the tank, especially in humid climates or if the tank isn't full.
* Water in the fuel supply: This could be due to a problem at the gas station (contaminated fuel), or issues with the underground storage tanks at the station.
* Faulty Fuel Filter: A clogged or failing fuel filter can't properly remove water and other contaminants.
* Fuel Pump Issues: In rare cases, a faulty fuel pump can allow water to seep into the fuel system.
* Sensor Malfunction: While less likely, the sensor detecting water in the fuel could be faulty, giving a false positive. This is less common than actual water contamination.
What to do:
1. Do NOT drive the car extensively. Driving with water in the fuel can damage the fuel injectors, fuel pump, and engine.
2. Check your fuel cap: Ensure it's tightly sealed.
3. Consider the source of your fuel: Did you recently fill up at a gas station you don't usually use?
4. Have it professionally diagnosed: A mechanic can properly diagnose the problem. They'll likely check the fuel for water contamination, inspect the fuel filter, and possibly run diagnostic tests. They can determine if the problem is simply contaminated fuel requiring a fuel system flush and filter replacement, or a more significant mechanical issue.
Ignoring the "Water in Fuel" light can lead to costly engine repairs. Get it checked out as soon as possible.
