| When working on the fuel supply/injection system, pay careful attention to the following five cleanliness rules: |
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| Thoroughly clean connections and surrounding area before releasing them. |
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| Place removed parts on a clean surface and cover. Do not use rags that shed fibres! |
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| Carefully cover or seal open components if repairs cannot be carried out immediately. |
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| Only fit clean components: Only remove new parts from their packaging immediately before fitting. Do not use parts that have been stored loose (e.g. in toolboxes etc.). |
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| If the system is open: do not work with compressed air if this can be avoided. Do not move vehicle unless absolutely necessary. |
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| Avoid spilling diesel on the coolant hoses. If necessary, clean the hoses immediately. Damaged hoses must be replaced. |
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