VALVE 7M9544 - Caterpillar

Contact with high pressure fuel may cause fluid penetration and burn hazards. High pressure fuel spray may cause a fire hazard. Failure to follow these inspection, maintenance and service instructions may cause personal injury or death.
Refer to the Operation and Maintenance Manual , "General Hazard Information and High Pressure Fuel Lines" before adjustments and repairs are performed.Note: Refer to Testing and Adjusting Manual , "Cleanliness of Fuel System Components" for detailed information on the standards of cleanliness that must be observed during ALL work on the fuel system.Ensure that all adjustments, maintenance and repairs are performed by authorized personnel that have had the correct training.
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.
If air enters the fuel system, the air must be purged from the fuel system before the engine can be started. Air can enter the fuel system when the following events occur:
The fuel tank is empty or the fuel tank has been partially drained.
The low pressure fuel lines are disconnected.
A leak exists in the low pressure fuel system.
The fuel filter has been replaced.Priming the Duplex Fuel Filters with the Engine Stopped
Note: The engine can have the ability to auto start. Ensure that the power supply is isolated before any service or repair is performed.Use the following procedures in order to remove air from the fuel system:
Illustration 1 g01627770
Typical example
(A) The fuel flow is to the left hand fuel filter.
(B) The fuel flow is to both fuel filters.
(C) The fuel flow is to the right hand fuel filter.
Illustration 2 g01628110
Typical example
(A) The fuel flow is to the left hand fuel filter.
(B) The fuel flow is to both fuel filters.
(C) The fuel flow is to the right hand fuel filter.Commissioning procedure
Use the following procedure in order to remove air from both fuel filters.Duplex Fuel Filters
The engine can have the ability to auto start. Ensure that the power supply is isolated before any service or repair is performed.
Illustration 3 g01634603
Secondary fuel filters
Ensure that the fuel system is in working order. Check that the fuel supply valve (if equipped) is in the "ON" position.
Ensure that the control levers are in position B. Refer to illustration 1 and illustration 2.
Loosen the vent screws (1) on the secondary fuel filter.
Illustration 4 g01628105
Typical example
Unlock the fuel priming pump by turning the handle (2) counterclockwise.
Operate the fuel priming pump in order to remove the air from the fuel filters. Operate the hand priming pump until fuel free from air flows from the vent screws.
Tighten the vent screws securely.
Operate the hand priming pump until a strong pressure is felt on the pump. Push the priming pump plunger inward and tighten the plunger by hand. Drain the tray that is below the filters. Note: Do not loosen the high pressure fuel lines in order to purge air from the system. This procedure is not required.
The engine fuel system should now be primed and the engine should now be able to start.
Operate the engine starter