UENR0623-02 59 Fuel System Viscosity of the fuel Lubricity of the fuel Air in the fuel Other fuel characteristics Refer to Operation and Maintenance Manual, “Fuel Recommendations” for more information on the cetane number of the fuel. i04371154 Fuel System - Prime 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 in- structions may cause personal injury or death. Illustration 52 g02882651 Typical example 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. 2. Open the screw (1) on the secondary fuel filter base. 3. Operate the hand priming pump. Count the number of operations of the pump. After approximately 80 depression of the pump stop. Ensure that all adjustments and repairs are performed by authorized personnel that have had the correct training. Note: As the fuel system is primed, the pressure will increase within the fuel system and this increase in pressure can be felt during priming. 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. 4. Tighten the screw (1) to a torque of 2.5 N·m (22 lb in). 5. The fuel system should now be primed and the engine should be able to start. 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: 6. Operate the engine starter 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. The fuel tank is empty or the fuel tank has been partially drained. 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. The low-pressure fuel lines are disconnected. A leak exists in the low-pressure fuel system. The fuel filter has been replaced. 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”. Use the following procedures in order to remove air from the fuel system: 1. Ensure that the fuel system is in working order. Check that the fuel supply valve (if equipped) is in the ON position.