SEAL-U-CUP 3382445 - Caterpillar

Day Tank
Fuel quality is critical to the performance and to the service life of the engine. Water in the fuel can cause excessive wear to the fuel system. Condensation occurs during the heating and cooling of fuel. The condensation occurs as the fuel passes through the fuel system and the fuel returns to the day tank. This causes water to accumulate in the day tank. Draining the day tank regularly and obtaining fuel from reliable sources can help to eliminate water from the fuel.Day tanks should have a provision for draining water and sediment.Open the drain valve on the bottom of the day tank in order to drain the water and the sediment. Close the drain valve.Drain the water and sediment from the day tank daily. The quality of the fuel and/or the operating conditions may require more frequent draining of the water and sediment.Fill the day tank after operating the engine in order to drive out moist air. This will help prevent condensation. Do not fill the tank to the top. The fuel expands as the fuel gets warm. The tank may overflow.Some day tanks use supply pipes that allow water and sediment to settle below the end of the fuel supply pipe. Some day tanks use supply lines that take fuel directly from the bottom of the tank. If the engine is equipped with this system, regular maintenance of the fuel system filter is important.Settling Tank
Drain the water and the sediment from the settling tank daily. Ensure that the temperature of the settling tank is proper for the viscosity of the fuel oil.Fuel Storage Tanks
Drain the water and the sediment from the fuel storage tank daily. Ensure that the water and sediment is drained from the fuel storage tank when the tank is refilled. This will help prevent water and/or sediment from being pumped from the fuel storage tank into the settling tank.