Fuel Supply System

Clean Working Conditions

Even a little contamination can lead to faults. When working on the fuel supply and on the fuel injection system, observe the following guidelines for a clean working environment:

• Before loosening, connections and surrounding areas must be cleaned thoroughly with engine or brake cleaner, and then cleaned area must be dried completely.

• Seal the open lines and connections immediately with clean plugs, for example, from the engine bung set (VAS 6122).

• Place removed parts on a clean surface and cover them with lint-free cloths.

• Carefully cover or plug unpacked components if repairs cannot be performed immediately.

• Only install clean components: Remove the replacement parts from their packaging just prior to installing them. Do not use parts that have been stored unpacked (for example in tool boxes etc.).

• When the system is open: Do not work with compressed air. Do not move vehicle unless absolutely necessary.

• In addition, do not let diesel fuel flow onto coolant hoses. If necessary, the hoses must be cleaned again immediately. Replace corroded hoses.

• Protect the disconnected connectors from dirt and moisture and only connect when they are dry.