TM10-3930-660-20 5-12. HIGH PRESSURE FUEL LINES - REPLACE This task covers: a. Removal b.  Installation Initial Setup Tools Tool Kit, Automotive Mechanics Shop Equipment, Automotive Maintenance, Common #2 Less Power Equipment  Condition Vehicle parked on level ground. Engine  cool. WARNING Do not smoke or allow open flame or sparks in the vicinity while working on any part of the fuel system. Diesel fuel is highly flammable and can cause injury or death if accidentally ignited. To prevent fire, remove fuel lines only when engine is cool. Inspect fuel lines for cracks and other signs of deterioration as they are removed. Replace if necessary. Fuel lines are not interchangeable. Identify and tag lines prior to removal from fuel injectors and fuel injection pump. 1. LOOSEN NUTS (1) ON FUEL LINES (2) AND REMOVE LINES (2) FROM FUEL INJECTORS (3). Inspect seats of fuel lines for nicks, gouges, or burrs. Replace if necessary. 5-25