Abstract: A fuel line leading from a fuel supply tank of a self-propelled aircraft to the engine is equipped with a normally open fuel cut-off valve adjacent the tank and with a vent control valve adjacent the engine. The vent control valve is normally open for supplying fuel to the engine and normally closed with respect to a vent which discharges into the atmosphere. At one end of the fuel line, in advance of these two valves, in the normal direction of flow of fuel through the line, the fuel line is connected to a pressurized source of evacuating fluid, such as a drum of carbon dioxide. A normally closed evacuation control valve is interposed in the line at that end at a location adjacent the evacuating fluid source and in advance of the fuel cut-off valve.