FUEL SYSTEM - TM-5-2410-237-230042

TM 5-2410-237-23

THEORY OF OPERATION - CONTINUED

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FUEL SYSTEM

NOTE

Refer to WP 0039 00 for more detailed fuel system theory of operation information.

Fuel Tank. Provides containment for fuel. It is located at the rear of the tractor.

Fuel Return Line. Provides a return route to the fuel tank for unused fuel. By allowing fuel to make a continual flow

through the system, the fuel is kept cool and free of air.

Priming Pump. Used to manually prime the fuel system. The fuel system must be primed whenever there is an interrup-

tion in the fuel supply.

Fuel Injection Nozzle. The nozzle goes through the cylinder head into the combustion chamber. Fuel is sent with high

pressure to the nozzle where the fuel is made into a fine spray for good combustion.

Fuel Injection Pump. Increases the pressure of the fuel, and sends an exact amount of fuel to the fuel injection nozzle.

There is one fuel injection pump for each cylinder of the engine.

Primary Fuel Filter. Filters all fuel coming from the fuel tank before the fuel enters the transfer pump.

Check Valves. Controls the flow of the fuel at the primary fuel filter. Also works in conjunction with the priming pump to

rid the system of air.

Fuel Transfer Pump. Pulls fuel from the fuel tank and pushes it through the system to the fuel manifold in the injection

pump housing.

Secondary Fuel Filter. Filters fuel a second time before it reaches the injection pump manifold.

10. Fuel Injection Pump Housing. Contains the fuel manifold and the injection pumps. The governor attaches to the hous-

ing.

11. Governor. Controls the amount of fuel needed by the engine to maintain a desired rpm.

12. Ether Starting Aid. Delivers a measured amount of ether into the inlet manifold to make cold weather starting easier. The

ether is stored under pressure in a cylinder. It is electrically activated from a button in the operator compartment.

GOVERNOR

FUEL RETURN LINE

FUEL

FUEL TANK

INJECTION

NOZZLE

ETHER STARTING AID

(LEFT SIDE OF ENGINE)

INJECTION PUMP

AND HOUSING

SECONDARY

387-052

PRIMING PUMP

TRANSFER PUMP

AND CHECK VALVES

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