3054, 3054B and 3056 Marine Engines Caterpillar

Fuel System - Prime

Usage:

3056 CKS

Priming the fuel system fills the fuel filter. Priming the fuel system removes air bubbles from the fuel system. Prime the fuel system under the following conditions:

Fuel system that is run dry
Storage
Fuel filter maintenance
Disconnecting fuel lines and installing fuel lines
Repair of leaks in the fuel lines
Removal of the fuel injection pump

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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.

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NOTICE

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

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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 disconnected fuel system component.

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Illustration 1	g00749720
Vent on top of the fuel filters

Loosen the bolt at the top of the fuel filter in order to open a vent.
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Illustration 2 g00286060

Priming lever for the fuel transfer pump

Note: The priming lever of the fuel transfer pump cannot be operated if the cam is at the maximum lift position. If this occurs, the crankshaft must be rotated one revolution.
Operate the priming lever for the fuel transfer pump until the flow of fuel from the vent is continuous and free of air bubbles. Tighten the bolt at the top of the fuel filter.
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Illustration 3 g00749721

Fuel line for the air inlet heater
Loosen the nut for the air inlet heater. Operate the priming lever for the fuel transfer pump until the flow of fuel from the fuel line is continuous and free of air bubbles. Tighten the union nut for the air inlet heater to a torque of 22 N·m (16 lb ft).
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Illustration 4 g00286062

Fuel lines for two of the fuel injectors
Loosen two of the fuel line nuts at two of the fuel injection nozzles in order to open two vents.

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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.
Ensure that the manual stop control (if equipped) is in the RUN position. Crank the starting motor until the flow of fuel from the vents is continuous and free of air bubbles. Tighten the fuel line nuts to a torque of 22 N·m (16 lb ft).
Ensure that all fuel line connections are secure and tightened to the proper torque. Ensure that any spilled fuel is cleaned up.
Start the engine. The engine may run rough. Run the engine at low idle until the engine runs smoothly. If the engine will not start, further priming may be necessary. If the engine starts and if the engine continues to misfire or smoke, then the fuel system may require more priming. Check for any leaks in the fuel system.