Final answer:
The correct course of action when a WIF alert is posted to the instrument panel is to drain the fuel-water separator, replace the fuel filters, and replace the water separator.
Step-by-step explanation:
The correct course of action when a WIF (Water In Fuel) alert is posted to the instrument panel is to drain the fuel-water separator, replace the fuel filters, and replace the water separator. This is because the WIF alert indicates the presence of water in the fuel system, which can damage the engine and affect its performance. Draining the fuel-water separator helps remove any water accumulated in the system, while replacing the fuel filters and water separator ensures that the fuel system is clean and free from water contamination.