SCREW-SPECIAL 3178725 - 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 Systems Operation, "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 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.
The engine has not been in use for an extended period.Hand Fuel Priming Pump
DO NOT loosen the high-pressure fuel lines in order to purge air from the fuel system. This procedure is not required.Use the following procedures in order to remove air from the fuel system:
Ensure that the fuel system is in working order to remove air from the fuel system. Ensure that the primary filter is clean and free from dirt.
Check that the fuel supply valve (if equipped) is in the ON position.
Illustration 1 g03352705
Typical example
Unlock priming pump handle (1) by turning handle counterclockwise. Note: During priming the hand pressure required to prime the fuel system will increase.
Operate the hand priming pump for 2 minutes. After 2 minutes, the system should be primed and the engine ready to be started. Lock and priming handle by securing the handle into the body of the pump (2). Push handle in and turn handle clockwise to lock. Note: Ensure priming handle (1) is locked correctly into place . If the priming handle is not locked into place, fuel flow to the fuel system will be obstructed.
Operate the engine starter and crank the engine . After the engine has started, operate the engine at a low idle for a minimum of 5 minutes. Operating the engine at a low idle will help ensure that the air has been removed from the fuel system.
If the engine will not start, repeat steps 2 to step 5. After the engine has stopped, you must wait for 10 minutes in order to allow the fuel pressure to be purged from the high-pressure fuel lines before any service or repair is performed on the engine fuel lines. If necessary, perform minor adjustments. Repair any leaks from the low-pressure fuel system and from the cooling, lubrication, or air systems. Replace any high-pressure fuel line that has leaked. Refer to Disassembly and Assembly, "Fuel Injection