That “Water in Fuel” light on your dash is not a friendly suggestion. It’s your diesel engine politely warning you that something expensive might be developing in the fuel system. Most modern diesel trucks (Powerstroke, Duramax, Cummins) have a water-in-fuel sensor and a fuel/water separator designed to catch water before it reaches high-pressure components. When the light comes on, the separator has collected enough water to trigger the sensor, or the system thinks it has. Manufacturers are blunt about what to do next: drain it immediately to avoid injection system damage.
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