DESCRIPTION AND OPERATION
Page 37
FUEL FILTRATION
Primary and secondary filter elements attach to
the underside of the fuel filter housing. The
housing, located at the front lower left side of the
cylinder block, has an integral hand-priming
pump for bleeding the system and draining water.
The pre-filter (primary filter) also separates water
from the fuel. Water collects in a cup on the
bottom of the pre-filter. There is a sensor to keep
track of the water and signal the EECU.
The collected water can be dumped only while
the engine is not running, the key is in the ON
position and the parking brake is set.
A one-way check valve located in the filter
housing prevents fuel from draining back to the
fuel tank when the engine is shut down. Also
included in the fuel filter housing is the fuel
pressure sensor just above the secondary filter.
Some trucks are built with a remote mounted fuel
water separator. In this case, the fuel is drawn
through the remote mounted filter before it
reaches the ECU cooler plate. On the filter base,
the mounting location for the standard primary
filter is blocked off with a plate.
UNIT INJECTORS
24
Figure 24 — Unit Injector Diagram
1. Injector Yoke
2. Copper Sleeve
3. O-Ring
4. Fuel Gallery
5. O-Ring
6. O-Ring
7. Pressure Relief Valve
8. Solenoid Coil
9. Solenoid Coil
10. Injector Valve
11. Injector Piston
12. Injector Nozzle
13. Washer
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