TM 10-3930-641-20
(Sheet 1 of 2)
FUEL SYSTEM DESCRIPTION
PRIMING PUMP. Used to prime fuel system on initial startup
4.
The direct injection fuel system consists of:
or after changing fuel filters. The priming pump also removes air
from the fuel system.
Fuel tank
1.
SECONDARY FUEL FILTER. A final filter before fuel enters
5.
Primary fuel filter
2.
injection pump.
Transfer pump
3.
INJECTION PUMP. Provides the injection nozzles with a
6.
metered, high pressure charge of fuel at a precise time.
Priming pump
4.
INJECTION NOZZLES. Spray the metered amount of fuel from
7.
Secondary fuel filter
5.
the injection pump into the cylinder for combustion.
Injection pump
6.
GOVERNOR. Controls the amount of fuel needed to keep the
8.
desired engine speed. The governor is controlled by the accelera-
Injection nozzles
7.
tor pedal.
Governor
8.
FUEL LINES. Carry fuel from the tank to various components
9.
of the fuel system and provide return routes for unused fuel.
Fuel lines
9.
ETHER
STARTING AID. Delivers
a measured amount of ether
10.
Ether starting aid
10.
into the
turbocharger inlet for ease
in cold weather starting. The
ether is
stored under pressure in a
cylinder and the amount to be
sprayed
into the inlet is controlled
by an electrically activated
valve.
FUEL TANK. Located next to the cab on the left side of the
1.
vehicle. The capacity of the tank is 165 gal. (625 liters). The tank
has a drain valve and drain plug at the bottom and a filler screen
and cap at the top.
PRIMARY FUEL FILTER. Filters all fuel coming from the fuel
2.
tank before the fuel enters the transfer pump.
TRANSFER PUMP. Sends the fuel to the priming pump,
3.
secondary filter and the injection pump.
Go on to Sheet 2
