If a fire starts in your trailer, don’t open the trailer doors; the additional oxygen will make the fire worse. Likewise, if a fire starts under the hood, don’t open it. Putting water on gasoline, grease or oil fires will only spread the fire farther. Instead, use a fire extinguisher that is rated for Class B (flammable liquid) fires. Use enough extinguishing material to put out the flames, but try to keep some in reserve in case the fire flares up again.