| Carefully observe the following 6 rules for cleanliness when working on the fuel supply or injection system. |
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| Thoroughly clean the connection points and their surroundings before releasing. |
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| Place removed parts on a clean surface and cover. Do not use fuzzy cloths! |
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| Carefully cover or close opened components if the repair is not completed immediately. |
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| Only install clean parts. Remove spare parts from their wrapping immediately before fitting. Do not use any parts which have been stored unwrapped (e.g. in tool boxes etc.). |
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| When the system is open: Avoid using compressed air. Avoid moving the vehicle. |
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| Also make sure no diesel fuel runs onto the coolant hoses. If this is the case clean the hoses immediately. Contaminated hoses must be replaced. |
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