| When working on the fuel supply/injection system, observe the following basic rules: |
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| Thoroughly clean all unions and surrounding areas before disconnecting. |
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| Place parts that have been removed on a clean surface and cover them over. Use plastic sheeting or paper. Use only lint-free cloths. |
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| Carefully cover or seal open components if repairs cannot be carried out immediately. |
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| Only install clean components; replacement parts should only be unpacked immediately prior to installation. Do not use parts that have been previously unpacked and stored away loose (e.g. in toolboxes, etc.). |
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| When the system is open: Do not work with compressed air if this can be avoided. Do not move the vehicle unless absolutely necessary. |
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| Also ensure that no diesel fuel comes into contact with the coolant hoses. Should this occur, the hoses must be cleaned immediately. Damaged hoses must be renewed. |
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