D439E Service Manual 4. Fuel system
193
Fuel Filter
Replacement
Removal
1. Remove fuel hose In and out.
2. Remove thermo switch and heater sensor.
3. Remove two mounting bolts IA) and fuel filter
assembly (B).
Installation
Installation is the reverse order of removal.
Inspection
1. General check
a. Crack bending, deformation, deterioration and
clogging of hose or pipe.
b. Clogging or damage of fuel filter.
2. When the filter has to be checked
a. When the fuel III the tank is drained out and
then replenished again for maintenance
reasons
b. When fuel filter is replaced
c. When fuel main hose (pipe) is removed
• Loosen the air plug of fuel filter.
• Cover air plug hole with cotton cloth and keep
pumping until it stops bubble.
• When bubbles are removed completely fasten
tile air plug and continue to pump until pump
operation effort feels heavy.
3. Water drain from the fuel filter
When water-warning lam p of fuel filter is turned
on It Indicates that fuel filter is filled with water So
that water should be drained by the following
sequence
CAUTION
If the vehicle is driven without draining the water
despite the warning lamp is on, it may cause
fatal trouble to the supply pump and injector.
a. Turn the water drain sensor about half way to
drain the water
CAUTION
Since water drains even if the plug is not fully
loosened, water removal sensor should not be
fully loosened.
b. If diesel fuel drains after water has been
drained completely fasten the water drain
sensor by hand.
Assembly
1. Apply oil to fuel filter cartridge and Install It to the
fuel filter head.
Fuel filter cartridge tightening torque : 1.0~1.5kgf.m
2. Perform [pump learning Initialization] with
diagnosis equipment after replacing fuel filter.
Refer to [pump learning initialization] procedure
when replacing ECU.
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