GUARD AS 1267983 - Caterpillar

Cleanliness of the Engine
Extreme cleanliness must be maintained when working on the fuel system, since even tiny particles can cause engine or fuel system problems.
The entire engine should be washed with a high-pressure water system. The high-pressure water system will remove dirt and loose debris before starting a repair on the fuel system. Ensure that no high-pressure water is directed at the injectors.Environment
When possible, the service area must be positively pressurized. Ensure that the components are not exposed to contamination from airborne dirt and debris. When a component is removed from the system, the exposed fuel connections must be closed off immediately with suitable sealing plugs. The sealing plugs should be removed only when the component is reconnected. Reuse the sealing plugs. Dispose of the sealing plugs immediately after use. Contact your nearest Caterpillar Dealer to obtain the correct sealing plugs.New Components
The fuel injection lines are not reusable. New fuel injection lines are manufactured for installation in one position only. When a fuel injection line is replaced, do not bend or distort the new line. Internal damage to the pipe may cause metallic particles to be introduced to the fuel.All new fuel filters, fuel injection lines, tube assemblies, and components are supplied with sealing plugs. These sealing plugs should be removed only to install the new part. If the new component is not supplied with sealing plugs, then the component should not be used. The technician must wear suitable rubber gloves. The rubber gloves should be disposed of immediately after completion of the repair to prevent contamination of the system.Refueling
To refuel the diesel fuel tank, the refueling pump, and the fuel tank cap assembly must be clean and free from dirt and debris. Refueling should take place only when the ambient conditions are free from dust, wind, and rain. Only use fuel, free from contamination, that conforms to the specifications in the Operation and Maintenance Manual, "Fluid Recommendations" Fuel Specifications.