SEAL-O-RING 8T5039 - Caterpillar

Note: Refer to Systems Operation, Testing, and Adjusting, "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.Use the following procedure in order to remove air from the fuel system:
Ensure that the fuel system is in working order. Check that the fuel supply valve (if equipped) is in the "ON" position.
Turn the keyswitch to the BATTERY CONNECTED position.
The keyswitch will allow the electric priming pump to operate. Operate the electric priming pump for 2 minutes.
Turn the keyswitch to the "OFF" position. The fuel system should now be primed and the engine should be able to start.
Operate the engine starting motor and crank the engine. After the engine has started, operate the engine at low idle for a minimum of 5 minutes. Ensure that the fuel system is free from leaks.Note: Operating the engine for this period will help ensure that the fuel system is free of air. DO NOT loosen the high-pressure fuel lines in order to purge air from the fuel system. This procedure is not required.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 Lines - Install".If you inspect the engine in operation, always use the proper inspection procedure in order to avoid a fluid penetration hazard. Refer to Operation and Maintenance Manual, "General hazard Information".If the engine will not start, refer to Troubleshooting, "Engine Cranks but will not Start".