2.21 – Fires Truck fires can cause damage and injury. Learn the causes of fires and how to prevent them. Know what to do to extinguish fires. 2.21.1 – Causes of Fire The following are some causes of vehicle fires After Accidents.Spilled fuel, improper use of flares. Tires. Under-inflated tires and duals that touch. Electrical System. Short circuits due to damaged insulation, loose connections. Fuel.Driver smoking, improper fueling, loose fuel connections. Cargo.Flammable cargo, improperly sealed or loaded cargo, poor ventilation. 2.21.2 – Fire Prevention Pay attention to the following Vehicle Inspection. Make a complete inspection of the electrical, fuel, and exhaust systems, tires, and cargo. Be sure to check that the fire extinguisher is charged. En Route Inspection. Check the tires, wheels, and truck body for signs of heat whenever you stop during a trip.