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Fuel vapors are invisible, explosive, and can be ignited by ignition sources many feet away. 2. Always fill outdoors. Never open or fill fuel bottle near flame (including pilot lights), or other ignition sources. It is normal for a pressurized fuel bottle to vent a small amount of fuel mist when unscrewing the bottle from the black pump assembly. 3. Always light and use stove outdoors; never inside house, camper, tent, or other unventilated or enclosed areas. 4. This stove consumes air (oxygen).