GASKET 4493078 - Caterpillar

Cleanliness of the Engine
Extreme cleanliness is important when working on the fuel system. Even tiny particles can cause engine or fuel system problems.
The entire engine should be washed with a high-pressure water system in order to remove dirt and loose debris before starting a repair on the fuel system. Ensure that no high-pressure water is directed at the seals for the injectors.Environment
Use a positively pressurized service area in order to 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 using correct, clean, sealing plugs. The sealing plugs should only be removed when the component is reconnected. The sealing plugs must not be reused. Dispose of the sealing plugs immediately after use. Contact your nearest Caterpillar Dealer in order to obtain the correct sealing plugs.New Components
When a fuel 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 lines, tube assemblies, and components are supplied with sealing plugs. These sealing plugs should only be removed in order 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 in order to prevent contamination of the system.Refueling
When refueling 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.