TM 5-3810-307-24-1-1
FUEL SYSTEM
DESCRIPTION
The fuel system consists of a fuel tank, fuel filter/
Surplus fuel, returning from the injectors, is bypassed
water separator, fuel pump, engine fuel filter, and fuel
back to the fuel tank. The continuous flow of fuel
injectors. All components except the fuel tank and
through the injectors helps to cool the injectors and to
heated fuel filter/water separator come installed on
remove air from the system.
the engine.
FUEL FILTER.
FUEL TANK.
The engine fuel filter, which comes as a component
The fuel tank is a steel tank located on the right side
of
the
engine,
incorporates
a
of the machine. The fuel tank has a capacity of 44
replaceable-element-type filter to remove impurities
gallons (166.6 liters). The fuel line connected to the
from the fuel. The filter is mounted on the engine
top of the tank provides the fuel supply to the engine
between the fuel pump and fuel injection pump.
and the fuel line connected to the bottom front side of
the tank carries the return surplus fuel from the
HEATED FUEL FILTER/WATER SEPARATOR.
engine. The tank is equipped with a screw-type filler
cap and a fuel level sender unit which provides a
The heated fuel filter/water separator removes water
signal to a fuel gauge on the instrument panels in the
from the fuel before it reaches the engine. It is
cabs.
mounted on the top left rear of the engine. As fuel
passes through the outer wrap of the first stage of the
FUEL PUMP.
filter paper, large droplets of water are formed as it is
stripped from the fuel. The water falls out into the
The Cummins engine has a positive displacement
void between the two paper elements and goes to a
gear-type metering fuel pump driven by an engine
reservoir in the bottom of the housing where it can be
power take-off through a coupling to one of the
drained through a drain valve at the bottom of the
accessories. The pump supplies fuel at low pressure
housing. This filter is installed in the system between
through the engine fuel filter to the fuel injection pump
the fuel tank and pump and operates under suction.
which distributes the fuel to the injectors.
The fuel filter/water separator also incorporates an
The fuel is finely atomized by the injector as it is
electrically operated heater which is actuated by a
injected into the cylinder and ignited by the heat of
temperature switch to warm the fuel whenever the
the compression. It is also metered before injection,
temperature of the fuel falls below 30 F (-1 C).
to meet the load requirements imposed upon the
engine.
