FUEL DELlVERY.

TM-9-2320-273-20 Truck 6 Ton 6x6 M939 M939A1 and M939A2 (Diesel) Manual
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TM 9-2320-273-20 2-24. FUEL DELlVERY. 1. FUEL GAGE. Needle actuated by electrical signal from sending unit which shows level of fuel in tank. 2. ENGINE RUN SWITCH. Energizes 12-volt electrical system, including circuits to solenoid shutoff valve and fuel level sending unit. 3. ClRCUIT BREAKER (CB-6). Protects electrical components of fuel system by opening cir- cuit when load exceeds 20 amps. Automatically recycles until overload is removed. 4. PUSH TUBE. Transmits motion from cam follower to rocker arm assembly. 5. INJECTOR. Cam timed to meter and inject fuel into each cylinder. 6. ROCKER ARM. Transmits directional movement from push tube to injector. 7. FUEL DELlVERY LINE. Carries fuel under pressure from fuel pump to fuel manifold. 8. BYPASS LINE. Carries excess fuel from manifold back to tank. 9. CAMSHAFT. Determines valve and injector timing. 10. TANK. 118-gallon (446.63 liters) capacity (110-gallon (416.35 liters) draw). 11. FUEL LEVEL SENDING UNIT. Provides electrical signal to fuel gage for indicating fuel quantity in tank. 12. CAM FOLLOWER. Mechanical lever transmits cam lobe movement from cam shaft to push tube. 13. FILTER. Throwaway filter removes impurities from fuel. Petcock in bottom allows operator to drain off water filtered from fuel. 14. SOLENOID SHUTOFF VALVE. Normally closed, shutting off fuel supply to engine. Open when engine run switch is ON. 15. SCREEN FILTER. Located in fuel pump. Provides additional filtration for fuel prior to entering engine. 16. MANUAL OVERRIDE FOR FUEL SHUTOFF SOLENOID. Normally closed, can be screwed open to allow operation of engine when solenoid is not working. 17. FUEL PUMP. Gear driven from compressor drive. Built-in governor meters fuel through screen filter, solenoid shutoff valve, and into injectors. Excess fuel from pump is returned to the tank, The tachometer drive is located on the pump housing. 18. AlR ACTUATING LINE. Carries pressurized air from intake manifold to fuel pump. Pres- sure from line opens valve in pump and allows full fuel flow. 2-20

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