7. Clean the gasket sealing surface of the fuel filter
base. Ensure that 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 Cat fuel filters.
Consult your Cat dealer for proper part numbers.
9. Install the new fuel filter. 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 would not be filtered and could be con-
taminated. Contaminated fuel will cause accelerated
wear to fuel system parts.
10. Install the clean fuel filter bowl on the new fuel
filter.
NOTICE
The water separator is under suction during normal
engine operation. Ensure that the vent plug is tight-
ened securely to help prevent air from entering the
fuel system.
11. Open the fuel tank supply valve.
12. Start the engine and check for leaks. Run the
engine for 1 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 to aeration of the fuel. If air enters the
fuel, check the components for overtightening or
under tightening.
i06544918
Fuel System Primary Filter/
Water Separator - Drain
SMCS Code: 1260-543; 1263-543
S/N: TGC1–Up
S/N: DJN1–Up
S/N: 9EP1–Up
S/N: TFT1–Up
S/N: BCW1–Up
S/N: RTY1–Up
S/N: 4BZ1–Up
Fuel leaked or spilled onto hot surfaces or electri-
cal components can cause a fire. To help prevent
possible injury, turn the start switch off when
changing fuel filters or water separator elements.
Clean up fuel spills immediately.
NOTICE
The water separator is not a filter. The water separa-
tor separates water from the fuel. The engine should
never be allowed to run with the water separator
more than half full. Engine damage may result.
NOTICE
The water separator is under suction during normal
engine operation. Ensure that the drain valve is tight-
ened securely to help prevent air from entering the
fuel system.
If your engine is equipped with high pressure fuel
lines you must wait for 60 seconds after the engine
has stopped, in order to allow the fuel pressure to be
purged from the high pressure fuel lines before any
service or repair is performed on the engine fuel
lines. If necessary, perform minor adjustments.
Repair any leaks from the low pressure fuel system
and from the cooling, lubrication or air systems.
Replace any high pressure fuel line that has leaked.
Refer to Disassembly and assembly Manual, “Fuel
Injection Lines - Install”.
SEBU7125-13
129
Maintenance Section
Fuel System Primary Filter/Water Separator - Drain
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