TM9-2320361-10 2-5. BODY EQUIPMENT CONTROLS AND INDICATORS a. Key 1 2 3 4 5 6 7 8 9 10 11 12 Fuel Tank Truck (M49A2C). Item and Function Meter records amount of fuel pumped out in gallons. Counter Control Lever is moved up or down to return numbers on meter to zero. Pressure Gage indicates condition of filter elements by showing difference in pressure between inlet and outlet side of filter. Pressure Gage Handle is turned right to no. 1 position to take pressure readings on inlet side of valve, and turned left to no. 2 position to take readings on outlet side of valve. Dump Valve Control is turned left to open automatic dump valve, which dumps water separated from fuel by filter separator unit. Manual Drain Valve Control is turned left to open manual drain valve to drain sump assembly. Gravity Delivery Line Gate Valve is turned left to let fuel flow through gravity delivery line. Pump Delivery Line Gate Valve is turned left to let fuel flow through pump and dispenser line. Delivery Pump Draincock is turned to drain fuel from delivery pump when maintenance is required. Meter Drain Knob is turned to drain fuel from meter when maintenance is required. Discharge Valve Control Levers are pulled back to open discharge valves which control flow of fuel from tank sections. Liquid Level Gage is dipped into tank sections to measure fuel level. 2-10