3054E and 3056E Industrial Engines Caterpillar

3056E

If air enters the fuel system, the air must be purged from the fuel system before the engine can be started. Air can enter the fuel system when the following events occur:

• The fuel tank is empty or the fuel tank has been partially drained.

• The low pressure fuel lines are disconnected.

• A leak exists in the low pressure fuel system.

• The fuel filter is replaced.

Use the following procedure in order to remove air from the fuel system:

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Illustration 1	g00911348

1. Loosen nut (2) on the fuel injection pump (1).
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   Illustration 2	g00911349

   Note: If the drive cam for the fuel priming pump is in the position of maximum cam lift, the priming lever will not operate. Rotate the crankshaft by hand one revolution.

2. Operate the priming lever (4) on the priming pump (3) until the fuel flows out of nut (2) free of air.

3. Tighten nut (2) to a torque of 23 N·m (17 lb ft).
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   Illustration 3	g00911351

4. If the fuel line for the air inlet heater has been drained, loosen nut (5). Observe the connection at the flare nut. Operate the priming lever on the fuel priming pump until the fuel is free of air.

5. Tighten nut (5) to a torque of 22 N·m (16 lb ft).
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   Illustration 4	g00911352

   Note: Damage to the fuel injection pump, to the battery, and to the starter motor can occur if the starter motor is used excessively to purge the air from the fuel system.

6. Loosen flare nuts (6) for the high pressure fuel lines on all of the fuel injection nozzles.
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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.

7. Observe the connection at the flare nut. Operate the starting motor until the fuel is free of air.

8. Tighten flare nuts (6) to a torque of 27 N·m (20 lb ft).

9. The engine is now ready to start. Operate the engine at low idle for a minimum of five minutes immediately after air has been removed from the fuel system.

   Note: Running the engine for this period of time will help ensure that the pump is completely free of air.