FUEL FILTER SERVICE
(See Figure 3D-4)
The fuel filter is mounted on the left front of engine on
the frame. Moisture and other foreign matter accumu-
late in the fuel filter. Periodically clean and replace the
filter element. (Refer to Section 11.)
Purge air from the fuel system after new filter has
been installed.
PURGING THE FUEL SYSTEM
(See Figure 3D-5)
Whenever the fuel filter or fuel piping are removed,
the fuel tank is completely emptied, or the engine has
not been used for an extended time, purge the system
of air as follows:
1. Fill the fuel tank with fuel.
2. Loosen the air vent screw at the top of the filter by
turning it counterclockwise two turns. Use a suit-
able container to catch fuel which will flow from
screw hole.
3. Turn ignition switch ON to allow electric fuel pump
to operate.
4. When bubbles disappear from fuel coming out of
the air vent screw hole, turn the screw back in
and turn ignition switch OFF.
5. Open the air vent plug on the fuel injection pump.
6. Turn ignition switch ON to allow electric fuel pump
to operate.
7. Close the air vent plug when air bubbles disappear
from the fuel flow and turn ignition switch OFF.
ENGINE
SECTION 3D. DIESEL ENGINE
3D-4
Figure 3D-4. Fuel Filter Service
Figure 3D-5. Purging the Fuel System
The engine may start during this process. Be
careful of injury due to moving components. If
the engine starts, continue purging the remain-
ing fuel injector lines.
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