Prime the fuel system in order to fill the fuel filter. Prime the fuel system in order to purge trapped air. The fuel system should be primed under the following conditions:
- Running out of fuel
- Storage
- Replacement of the fuel filter
Cat C7 fuel primer pump location is near the secondary fuel filter as you can see in the picture.
Engines that are Equipped with a Fuel Priming Pump
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| NOTICE |
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| Do not loosen the fuel lines at the fuel manifold. The fittings may be damaged and/or a loss of priming pressure may occur when the fuel lines are loosened. |
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- Open the fuel priming pump and operate the fuel priming pump until a strong pressure is felt. This procedure will require considerable strokes. Lock the fuel priming pump.
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| NOTICE |
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| 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. |
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- Promptly start the engine. If the engine runs rough, continue to operate the engine at low idle. Do not raise the engine rpm above an idle, until the engine operates smoothly.
- If the engine does not start, open the fuel priming pump and repeat Steps 1 and 2 in order to start the engine.
Engines that are Not Equipped with a Fuel Priming Pump
If the engine is not equipped with a fuel priming pump, you can use the following procedures to prime the fuel system. These procedures will allow only filtered fuel to enter the fuel system.
Fuel Filter Bases that are Equipped with a Plug
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| NOTICE |
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| 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 any disconnected fuel system components. |
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