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Fuel System - Prime

Use the following procedure in order to prime the fuel system:

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.

Primary filter

Ensure that the air is removed from the primary filter before you prime the fuel filters.

Fuel filters

There are three types of fuel filter that may be installed on the engine.

• Element

• Canister

• Spin-on filter with fuel priming pump

Vent screw (3) is installed on the filter that has an element. Vent screw (4) is installed on the fuel filter that has a canister. Vent screw (5) is installed on the spin-on filter.

Priming the system

Ensure that the air is removed from the primary filter. Loosen vent screws (1). Operate the priming pump. When fuel free from air flows from the vent screw tighten the vent screw.

Note: Some fuel system will use gravity in order to prime the primary fuel filter. If gravity is used ensure that the fuel tank is full and that all stop valves in the fuel line are open.

There is four different types of systems that can be installed on the engine in order to prime the fuel system.

• Hand priming pump

• In-line hand priming pump

• Electrical priming pump

• Transfer pump that is operated by the starting motor

Hand Priming Pump 6

In order to identify the hand priming pump.

1. Ensure that fuel valve (2) for the fuel filter that has an element is in the ON position.

2. Loosen vent screw (3 4 or 5) on the fuel filter.

3. Operate hand priming pump (6). When fuel free from air flows from the vent screw tighten the vent screw.

4. Loosen connection (10 or 12) at the fuel injection pump.

   Note: Fuel return line (11) may need to be removed in order to prime the fuel system.

5. Operate the hand priming pump. When fuel free from air flows from the connections tighten the connecting bolt.

6. The engine should now be able to start. Operate the starting motor in order to start the engine.

   Note: Do not operate the starting motor for more than 15 seconds. If the engine does not start after 15 seconds, stop and wait for 30 seconds before trying again.

In-line Priming Pump 7

In order to identify the in-line priming pump.

1. Ensure that fuel valve (2) for the fuel filter that has an element is in the ON position.

2. Loosen vent screw (3 4 or 5) on the fuel filter.

3. Operate in-line priming pump (7). When fuel free from air flows from the vent screw tighten the vent screw.

4. Loosen connection (10 or 12) at the fuel injection pump.

   Note: Fuel return line (11) may need to be removed in order to prime the fuel system.

5. Operate the in-line priming pump. When fuel free from air flows from the connections tighten the connecting bolt.

6. The engine should now be able to start. Operate the starting motor in order to start the engine.

   Note: Do not operate the starting motor for more than 15 seconds. If the engine does not start after 15 seconds, stop and wait for 30 seconds before trying again.

Electrical Priming Pump 8

In order to identify the electrical priming pump.

1. Ensure that fuel valve (2) for the fuel filter that has an element is in the ON position.

2. Loosen vent screw (3 4 or 5) on the fuel filter.

3. Operate electrical priming pump (8). When fuel free from air flows from the vent screw tighten the vent screw. Switch off the electrical priming pump.

4. Loosen connection (10 or 12) at the fuel injection pump.

   Note: Fuel return line (11) may need to be removed in order to prime the fuel system.

5. Operate the in-line priming pump. When fuel free from air flows from the connections tighten the connecting bolt.

6. The engine should now be able to start. Operate the starting motor in order to start the engine.

   Note: Do not operate the starting motor for more than 15 seconds. If the engine does not start after 15 seconds, stop and wait for 30 seconds before trying again.

Fuel Transfer Pump 9

In order to identify the fuel transfer pump.

Note: In order to use the transfer pump, you must operate the starting motor. Do not operate the starting motor for more than 15 seconds. After 15 seconds, stop and wait for 30 seconds before operating the starting motor.

1. Ensure that fuel valve (2) for the fuel filter that has an element is in the ON position.

2. Loosen vent screw (3 4 or 5) on the fuel filter.

3. Operate fuel transfer pump (9). When fuel free from air flows from the vent screw tighten the vent screw. Stop the fuel transfer pump.

4. Loosen connection (10 or 12) at the fuel injection pump.

   Note: Fuel return line (11) may need to be removed in order to prime the fuel system.

5. Operate the fuel transfer pump. When fuel free from air flows from the connections tighten the connecting bolt. Stop the transfer pump.

6. The engine should now be able to start. Operate the starting motor in order to start the engine.

   Note: Do not operate the starting motor for more than 15 seconds. If the engine does not start after 15 seconds, stop and wait for 30 seconds before trying again.