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2. Drain Fuel Tank through Fuel Cap Opening and wash Fuel Cap Filter with clean fuel. 3.Using a small amount of kerosene,swirl and rinse the inside of the tank. Never mix water with the kerosene as it will cause poor operation of the heater. Pour the kerosene out making sure that you remove it all. IMPORTANT : Do not store kerosene over summer months for use during next next heating season. Using old fuel could damage heater. 4. Reinstall Fuel Cap Filter and Fuel Cap(See Figure 11). IMPORTANT :