Diesel fuel is subject to contamination and deterioration over time, and one reason for egular generator set exercise is to use up stored fuel over the course of a year before it degrades. In additional to other fuel system service recommended by the engine manufacturer, the fuel filters should be drained at the interval indicated in FIGURE 1. Water vapor accumulates and condenses in the fuel tank and must also be periodically drained from the tank along with any sediment present.
