C4.4 Generator Sets Caterpillar

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Fuel leaked or spilled onto hot surfaces or electrical 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.

If your engine is equipped with high-pressure fuel lines you must wait for 60 seconds after the engine has stopped. Waiting 60 seconds after the engine has stopped allows the fuel pressure to be purged from the high-pressure fuel lines. Allow pressure to purge 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".

Spin-on filter

Turn the valves for the fuel lines (if equipped) to the OFF position before performing this maintenance. Place a tray under the fuel filter in order to catch any fuel that might spill. Clean up any spilled fuel immediately.

Illustration 1	g01121396
(1) Spin-on filter (2) Drain

1. Clean the outside of the fuel filter assembly. Open the fuel drain (3) and drain the fuel into a suitable container.

2. Use a suitable tool in order to remove the spin-on filter (2) from the filter head (1).

3. Ensure that the fuel drain (3) on the new spin-on filter is closed.
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   Illustration 2	g01121723

4. Lubricate the sealing ring (4) with clean fuel oil.

5. Install the spin-on filter (2) into the top of the filter head (1).

6. Tighten the spin-on filter by hand until the sealing ring contacts the filter head. Rotate the spin-on filter through 90 degrees.

7. Prime the fuel system. Refer to Operation and Maintenance Manual, "Fuel System - Prime".