What is the correct course of action when a WIF alert is posted to the DDU?

When a Water in Fuel (WIF) alert is posted to the Diesel Data Unit (DDU), the primary action that should be taken is to drain the water separator sump. This is crucial because the presence of water in the fuel system can lead to significant engine performance issues, fuel injector damage, or even complete engine failure. The water separator is specifically designed to remove any water that contaminates the diesel fuel, and it is essential to address the WIF alert promptly to prevent further complications.

Draining the water separator sump ensures that any accumulated water is removed before it can mix with the fuel and potentially cause issues in the fuel system. Regular maintenance and monitoring of the water separator are vital for the longevity and efficiency of the engine. While replacing fuel filters and the water separator may be necessary under certain conditions, the immediate response to a WIF alert focuses on draining the separator sump to address the water contamination promptly.