C7 Industrial Engine Operation and Maintenance Manual – Fuel System – Prime

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

Engines that are Equipped with a Fuel Priming Pump

 

 


NOTICE
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.

 

  1. 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.

 

 


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.

 

  1. 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.

 

  1. 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

 

 


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 any disconnected fuel system components.

 

(1) Plug

(2) Fuel filter

 

  1. Remove plug (1) in order to fill fuel filter (2). Ensure that air is able to vent from the fitting of the plug while the fuel filter is being filled. Clean up any spilled fuel immediately. Clean plug (1). Install plug (1) .

 


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.

 

  1. Start the engine and operate the engine at low idle. Do not raise the engine speed above an idle, until the engine operates smoothly.

Fuel Filter Bases that are Not Equipped with a Plug

 


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.

 

  1. Operate the starting motor. This will fill the fuel filter and the fuel lines with fuel.

 

  1. Once the engine starts, operate the engine at low idle. Do not raise the engine speed above an idle, until the engine operates smoothly.

 

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