HARNESS AS-CONTROL 5254439 - Caterpillar

Probable Causes
Leaking seals on the case of the unit injector or on the barrel of the unit injector
Leaking seals on the fuel line adapter for the cylinder head
Excessive leakage from the unit injector tip or breakage of the unit injector tip
Cracked fuel supply manifold
Leaking seal on the fuel transfer pumpNote: For additional information, refer to , REHS3007, "Determining the Cause of Fuel Dilution of Engine Oil".Recommended Actions
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.
Do not loosen any high pressure fuel lines when the engine is running. The high pressure in the fuel lines can cause personal injury or death. Wait 60 seconds after the engine has stopped to allow pressure to purge before any service or repair is performed on the engine fuel lines.
Leaking Seals on the Case of the Unit Injector or on the Barrel of the Unit Injector
Look for signs of damage to the seals for the unit injectors. Replace any seals that are leaking.Leaking Seals on the Fuel Line Adapter for the Cylinder Head
Look for signs of damage to the seals on the fuel line adapter for the cylinder head. Repair any leaking fuel lines or components and/or replace any leaking fuel lines or components.Excessive Leakage from the Unit Injector Tip or Breakage of the Unit Injector Tip
Look for signs of damage to the unit injectors. If necessary, repair the unit injectors or replace the unit injectors.Cracked Fuel Supply Manifold
Look for signs of damage to the fuel supply manifold.Leaking Fuel Transfer Pump Seal
Ensure that the weep hole is not plugged. If necessary, repair the fuel transfer pump or replace the fuel transfer pump.