C-15 Petroleum Engine Caterpillar

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	g01064013
Fuel filter base (1) Air purge plug (2) Fuel pressure regulating valve

2. Use a wrench to loosen air purge plug (1). Turn the plug for three full turns in the counterclockwise direction. Do not remove the air purge plug.

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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. If the engine does not start after 30 seconds, allow the starter motor to cool for two minutes before attempting to start the engine again.

   Note: You may use the hand priming pump to prime the fuel system instead of cranking the engine.

4. While the engine is running, observe the air purge plug for a drop of fuel. When a small droplet of fuel appears at the threads of the plug, tighten the air purge plug.

   Note: There may be a noticeable change in the sound of the running engine when the air purge plug 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	g01064013
Fuel filter base (1) Air purge plug (2) Fuel pressure regulating valve

3. Use a wrench to loosen fuel pressure regulating valve (2). Turn the valve assembly for two and one half turns in the counterclockwise direction.

   Note: Do not remove the regulating valve completely. Loosen the regulating 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 two minutes.

   Note: You may use the hand priming pump to prime the fuel system instead of cranking the engine.

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

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

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

The Engine Has Been Rebuilt

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

2. Fill the fuel tank(s) with clean diesel fuel.

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Illustration 3	g01064013
Fuel filter base (1) Air purge plug (2) Fuel pressure regulating valve

3. Use a wrench to loosen air purge plug (1). Turn the plug for three full turns in the counterclockwise direction. Do not remove the air purge plug.

4. Use a wrench to loosen fuel pressure regulating valve (2). Turn the valve assembly for two and one half turns in the counterclockwise direction.

   Note: Do not remove the regulating valve completely. Loosen the regulating 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.

5. 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 two minutes.

   Note: You may use the hand priming pump to prime the fuel system instead of cranking the engine.

6. Crank the engine for 30 seconds. Allow the starter motor to cool for two minutes.

7. Close and tighten the air purge plug.

8. Crank the engine for 30 seconds. Allow the starter motor to cool for two minutes.

9. Close and tighten the fuel pressure regulating valve.

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

10. Crank the engine for 30 seconds. Allow the starter motor to cool for two minutes.

11. Repeat Step 10 until the engine starts and runs.

12. Clean any residual fuel from the engine components.