TM 9-2320-209-10-1 4-9. OPERATION OF FUEL TANK TRUCKS. General. M49A1C fuel trucks are equipped with a 200-gallon tank, a 400- gallon center tank, and a 600-gallon rear tank. M49A2C fuel trucks are equipped with two 600-gallon tanks. Operating procedures described in this paragraph are for both M49A1C and M49A2C fuel trucks. It should be noted that illustrations given are for the M49A2C configuration. Certain procedures where discharge valve control levers are operated will note two levers on M49A2C trucks and three levers on M49A1C trucks. b. Gravity Filling the Fuel Tank Sections. FRAME 1 WARNING To prevent fire or explosion, smoking, flame, sparks, and glowing or hot objects are not allowed near truck during filling and delivery of fuel. Make sure that rear and dispenser nozzle grounding wires are properly connected for static discharge before transferring of fuel. NOTE Drain compartments and piping system, including filter/ separator, when changing to a fuel or grade different from the one last carried. Flush with 50 gallons of new product, and circulate new product back to each com- partment twice. Circulate new product through all fuel handling components, including meter, filter/separator, and hose reels when applicable. Get rid of this fuel in the approved area after flushing. 1. Start engine. (Refer to para 4-6 b.) 2. Place truck near fuel supply with filler hole (1) in an easy to reach position. GO TO FRAME 2 4-98