
SEBU8088-06 101
Maintenance Section
Fuel System Primary Filter (Water Separator) Element - Replace
i02049797
Fuel System Primary Filter
(Water Separa
tor) Element -
Replace
SMCS Code: 126
0-510-FQ; 1263-510-FQ
Water in the fuel can cause the engine to run rough.
Water in the f
uel may cause an electronic unit injector
to fail. If the fuel has been contaminated with water,
the element should be changed before the regularly
scheduled in
terval.
The primary filter/water separator also provides
filtration in
order to help extend the life of the
secondary fuel filter. The element should be changed
regularly. Install a vacuum gauge. Change the
element for
the primary filter/water separator if the
pressure is at 50 to 70 kPa (15 to 20 inches Hg).
Replace the Element
Fuel leaked or spilled onto hot surfaces or elec-
trical components can cause a fire. To help pre-
vent possible injury, turn the start switch off when
changing fuel filters or water separator elements.
Clean up fuel spills immediately.
g00668636
Illustration 66
(1) Bowl
(2) Elem ent
(3) Drain
1. Stop the engine.
2. Turn the start switch to the “OFF” p osition.
3. Shut off the fuel tank supply valve to the engine.
4. If the primary fuel filter is equipped with a drain
valve (3), open the drain valve in order to drain any
fuel from the filter case. Close the drain valve (3).
NOTICE
Use a suitable c
ontainer to catch any fuel that might
spill. Clean up any spilled fuel immediately.
5. Remove the fuel
filter bowl (1) and wash the fuel
filter bowl with clean diesel fuel.
6. Remove the fue
l filter (2).
7. Clean the gasket sealing surface of the fuel filter
base. Ensure t
hat all of the old gasket is removed.
8. Apply clean diesel fuel to the new fuel filter gasket.
NOTICE
In order to maximize fuel system life and prevent pre-
mature wear out from abrasive particles in the fuel,
use Caterpill
ar fuel filters.
Consult your Caterpillar dealer for proper part num-
bers.
9. Install the new fuel filter (2). Spin the fuel filter
onto the fuel filter base until the gasket contacts
the base. Use
the rotation index marks on the
filters as a guide for proper tightening. Tighten the
filter for an additional 3/4 turn by hand. Do not
overtighten
the filter.
NOTICE
Do not fill the fuel filters with fuel before installing them.
The fuel wou
ld not be filtered and could be contami-
nated. Contaminated fuel will cause accelerated wear
to fuel system parts.
10. Install the clean fuel filter bowl (1) on the new fuel
filter.
NOTICE
The water se
parator is under suction during normal
engine operation. Ensure that the vent plug is tight-
ened securely to help prevent air from entering the fu-
el system.
11. Open the fuel tank supply valve.
12. Start the engine and check for leaks. Run the
engine for one minute. Stop the engine and check
the engine
for leaks again.
Detection of leaks is very difficult especially if
the engine
is running. The primary filter/water
separator is under suction. A leak will allow air to
enter the fuel. The air in the fuel can cause low
power due t
o aeration of the fuel. If air enters the
fuel, check the components for overtightening or
undertightening.