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 TM 55-1905-217-34
CHAPTER 3
REPAIR OF ENGINE AND TRANSMISSION
Section I. ENGINE ACCESSORIES
3-1. Engine Fuel System
a. This diesel engine fuel system (fig. 3-1) consists of fuel inlet and outlet manifolds, fuel injectors, fuel pipes, fuel
pumps, fuel valves, fuel filters and strainers, restricted elbow, and the necessary connecting lines.
Figure 3-1. Fuel system diagram.
b. Fuel is drawn from the fuel 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 filters and into the upper fuel manifold, then through fuel pipes into
the inlet side of the fuel injectors. Surplus fuel returns from the outlet side of the injectors through outlet fuel pipes into the
return manifold and back to the fuel tank.
3-2. Fuel Injectors
a. Description.
(1) The fuel injector (fig. 3-2) is a lightweight compact unit which enables quick easy starting on diesel fuel
and permits the use of a simple open type combustion chamber. The fuel injector creates high fuel pressure required for
efficient operation, it meters and injects the exact amount of fuel required to handle the load, atomizes the fuel for mixing
with the air in the combustion chamber and permits continuous fuel flow.
Change 1
3-1
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