5005572 JOHNSON *COVER, Carburetor body

The Secondary Fuel Filter Has Been Replaced
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.
Note: Refer to Operation and Maintenance Manual, "Fuel System Secondary Filter - Replace" for information on replacing the filter.
Turn the ignition switch to the "OFF" position.
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.
Start the engine. Operate the engine at 1000 to 1200 rpm until the engine runs smoothly in order to remove the residual air from the fuel system.
Once the engine runs smoothly, stop the engine. Turn the ignition switch to the OFF position.Note: You may use the hand priming pump for the fuel filter (IF EQUIPPED) instead of starting the engine and running the engine. Perform the following procedure when the hand priming pump is used:
Illustration 1 g00975173
C-10 and C-12 Truck engines (1) Air purge screw (2) Fuel priming pump (3) Priming valve
Turn the priming valve (3) to the "Closed (Prime)" position in order to prime the fuel system.
Open the air purge screw (1) for the fuel filter by three full turns. Do not remove the air purge screw.
While you operate the hand priming pump (2), observe air purge screw (1). When a small drop of fuel appears at the threads of the air purge screw, close and tighten air purge screw (1) .Note: Failure to tighten all fittings could result in serious fuel leaks.
Clean any residual fuel from the engine components.
Continue to operate the fuel priming pump (2) until a strong resistance is felt. Listen for an audible click from the fuel manifold. The click will indicate that the valve has opened and the fuel system is pressurized. Lock the fuel priming pump (2) .
Do not crank the engine for more than 30 seconds. Allow the starting motor to cool for two minutes before cranking again.
Crank the engine. If the engine starts but the engine runs rough, continue to operate the engine at low idle until the engine runs smoothly.Note: If the engine will not start, further priming is necessary. If the engine starts but the engine continues to misfire or smoke, further priming is necessary.
After the engine has operated smoothly for 30 seconds, turn the priming valve (3) to the "Open (Run)" position.Note: Shortened injector life may occur if the priming valve (3) is left in the "Closed (Prime)" position.The Engine Has Been Run Out of Fuel
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.
Turn the ignition switch to the "OFF" position.
Fill the fuel tank(s) with clean diesel fuel.
Illustration 2 g00975173
C-10 and C-12 Truck engines (1) Air purge screw (2) Fuel priming pump (3) Priming valve
Turn the priming valve (3) to the "Closed (Prime)" position in order to prime the fuel system.
Open air purge screw (1) for the fuel filter by three full turns. Do not remove the air purge screw.
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.
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 2 minutes.Note: Most of the air should be purged from the system after four or five cranking cycles.
Crank the engine for 30 seconds. Allow the starter motor to cool for 2 minutes.
Repeat Step 6 until the engine starts and runs. If the engine runs rough, continue to operate the engine at low idle until the engine runs smoothly.
Observe air purge screw (1). When a small drop of fuel appears at the threads of the air purge screw, close and tighten air purge screw (1) .Note: Failure to tighten all fittings could result in serious fuel leaks.
After the engine has operated smoothly for 30 seconds, turn the priming valve (3) to the "Open (Run)" position.