TUBE AS 4663199 - Caterpillar

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.
Use a suitable container to catch any fuel that might spill. Clean up any spilled fuel immediately.
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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Typical location of vent on top of the fuel filtersDual fuel filters shown
Loosen the bolt at the top of the fuel filter in order to open a vent.
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Priming lever for the fuel transfer pumpNote: 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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Fuel line for the air inlet heater for the 3056 Marine engine is shown
The engine may be equipped with an 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.
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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.
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 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.