C9.3 Industrial Engine and CX31-P600-C9I Petroleum Power Train Package Caterpillar

Water in the fuel can cause the engine to run rough. Water in the fuel 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 interval.

Replace the Element

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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.

Note: Always use genuine Cat fuel filters to ensure proper filtration. Cat filters are designed with Cat fuel systems to provide the best filtration for advanced electronic fuel injection systems.

1. Close the main fuel supply valve.
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   Illustration 1	g00104012
   (1) Element. (2) Bowl. (3) Drain.

2. Remove element (1) from the element mounting base while bowl (2) is attached.
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   NOTICE
   Do not allow dirt to enter the fuel system. Thoroughly clean the area around a fuel system component that will be disconnected. Fit a suitable cover over any disconnected fuel system components.

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   NOTICE
   Use a suitable container to catch any fuel that might spill. Clean up any spilled fuel immediately.

3. Dispose of the fuel in the fuel filter element. Remove bowl (2) from element (1). The bowl is reusable. Do not discard the bowl. Dispose of the used element.

4. Remove the O-ring from the gland of the bowl. Clean the following components:

   • Bowl

   • O-ring

   • Mounting base

   Inspect the O-ring for damage and for deterioration. Replace the O-ring, if necessary.

5. Lubricate the O-ring with clean diesel fuel.

6. Install bowl (2) on a new element. Tighten the bowl by hand. Do not use tools in order to tighten the bowl.

7. Lubricate the top seal of element (1) with clean diesel fuel. The element may be filled with fuel at this time. Install the new element on the mounting base. Tighten the element by hand.
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   NOTICE
   The water separator is under suction during normal engine operation. Ensure that the vent plug is tightened securely to help prevent air from entering the fuel system.

8. Open the main fuel supply valve.

9. Start the engine and check for leaks. Run the engine for 1 minute. Stop the engine and check for leaks again.

   Detection of leaks is difficult while 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.