TM 5-3810-306-20
FUEL SYSTEM
General
The function of the fuel system is to inject a metered quantity of clean, atomized fuel into the engine cylinders at a precise
time near the end of the compression stroke of each piston. The components of the system contribute to the delivery of
fuel to the cylinders.
The fuel system consists of the fuel tank, fuel-filters, strainer, water separator, fuel pump, and the fuel injectors. All
components except the fuel tank are installed on the engine.
Fuel Tank
The fuel tank is a steel cylinder-type tank located on the left side of the crane. The fuel tank has a draw capacity of 100
gallons (379 liters). Two connections on top of the tank provide for fuel supply to the engine and return of surplus fuel
from the engine. The tank is equipped with a locktype filler cap and a fuel quantity sender unit which provides a signal to a
fuel gauge on the instrument panel in the cab.
Fuel Filter and Strainer (Pre-filter)
A replaceable spin-on type fuel filter is used in the fuel system to remove impurities. The filter is adjacent to the water
separator.
The fuel strainer is mounted on the carrier frame rail on the right side of the engine. The unit includes a removable
sediment bowl.
Fuel Pump
The engine has a positive displacement gear-type metering fuel pump driven by an engine power take-off. The pump
supplies fuel at low pressure to the injectors, where the high pressure necessary for atomization of the fuel is created.
The fuel oil is finely atomized as it is injected into the cylinder and ignited by the heat of the compression. It is metered
before injection, to meet the load requirements imposed upon the engine.
Fuel Filter-Water Separator
The replaceable spin-on type fuel filter-water separator removes water from the fuel before it reaches the engine. It is
mounted on the right side of the engine.
The fuel mixture passes through the outer wrap of the first stage of the filter paper, where large droplets of water are
formed as it is stripped from j the fuel. The water falls out into the void between the two paper elements and goes to a
reservoir in the bottom of the housing, where it can be drained through a petcock (knurled knob) at bottom of the shell.
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