TM 5-3810-300-24&P-3
2
SECTION 2
FUEL SYSTEM AND GOVERNORS
CONTENTS
Fuel System...........................................................................................................................
Fuel Injector (Needle Valve) ..................................................................................................
Fuel Injector Tube .................................................................................................................
Fuel Pump .............................................................................................................................
Fuel Strainer and Fuel Filter ..................................................................................................
Fuel Manifold .........................................................................................................................
Fuel Manifold .........................................................................................................................
Mechanical Governors ..........................................................................................................
Limiting Speed Mechanical Governor ...................................................................................
Limiting Speed Mechanical Governor (Fuel Modulating) ......................................................
Limiting Speed Mechanical Governor (Dual High-Speed Range) .........................................
Limiting Speed Mechanical Governor (Variable Low-Speed)................................................
Limiting Speed Mechanical Governor (Fast Idle Cylinder) ....................................................
Shop Notes - Trouble Shooting - Specifications - Service Tools ..........................................
FUEL SYSTEM
The fuel system (Fig. I) includes the fuel injectors, fuel
pipes (inlet and outlet), fuel manifolds (integral with the
cylinder head), fuel pump, fuel strainer, fuel filter and fuel
lines.
Fuel is drawn from the supply tank through the fuel
strainer and enters the fuel pump at the inlet side.
Leaving the pump under pressure, the fuel is forced
through the fuel filter and into the inlet fuel manifold, then
through fuel pipes into the inlet side of each fuel injector.
The fuel manifolds are identified by the words "IN" (top
passage) and "OUT" (bottom passage) which are cast in
several places in the side of the cylinder head. This aids
installation of the fuel lines.
Surplus fuel returns from the outlet side of the injectors
to the fuel return manifold and then back to the supply
tank.
All engines are equipped with a restrictive fitting in the
Fig. 1 - Schematic Diagram of Typical Fuel System
fuel outlet manifold to maintain the fuel system pressure.
Refer to Section 13.2 for the size fitting required.
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