C-18 Truck Engines Caterpillar

C18 Truck Engines

The Secondary Fuel Filter Has Been Replaced

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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: Refer to Operation and Maintenance Manual, "Fuel System Secondary Filter - Replace" for information on replacing the filter.

1. Turn the ignition switch to the "OFF" position.
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   Illustration 1	g00634216
   Typical example (1) Air purge screw (2) Fuel pressure regulating valve (3) Hand priming pump (IF EQUIPPED)

2. Open air purge screw (1) for the fuel filter by three full turns. Do not remove the air purge screw.
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   NOTICE
   Do not crank the engine continuously for more than 30 seconds. Allow the starting motor to cool for two minutes before cranking the engine again.

3. Start the engine. The engine should start and the engine should run smoothly.

   Note: You may use the hand priming pump for the fuel filter (IF EQUIPPED) instead of starting engine and running the engine.

4. While the engine is running, observe air purge screw (1). When a small drop of fuel appears at the threads of the air purge screw, close and tighten air purge screw (1).

   Note: There may be a noticeable change in the sound of the running engine when the air purge screw is tightened. The change in the sound of the engine is normal.

   Note: Failure to tighten all fittings could result in serious fuel leaks.

5. Clean any residual fuel from the engine components.

The Engine Has Been Run Out of Fuel

1. Turn the ignition switch to the "OFF" position.

2. Fill the fuel tank(s) with clean diesel fuel.
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   Illustration 2	g00634216
   Typical example (1) Air purge screw (2) Fuel pressure regulating valve (3) Hand priming pump (IF EQUIPPED)

3. Open fuel pressure regulating valve (2) by two and a half turns. The regulating valve is located in the integral fuel filter base.

   Note: Do not remove the regulating valve completely. Open the valve enough to allow the air that is trapped in the cylinder head to be purged from the fuel system.

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   NOTICE
   Do not crank the engine continuously for more than 30 seconds. Allow the starting motor to cool for two minutes before cranking the engine again.

4. Crank the engine for 30 seconds. Use a suitable container to catch the fuel while you crank the engine. Allow the starter motor to cool for 2 minutes.

   Note: You may use the hand priming pump (3) (IF EQUIPPED) for the fuel filter instead of cranking the engine.

5. Crank the engine for 30 seconds. Allow the starter motor to cool for 2 minutes.

6. Close and tighten fuel pressure regulating valve (2).

7. Crank the engine for 30 seconds. Allow the starter motor to cool for 2 minutes.

8. Repeat Step 7 until the engine starts and the engine runs.

   Note: Failure to tighten all fittings could result in serious fuel leaks.

9. Clean any residual fuel from the engine components.