| When working on the fuel supply and injection systems, pay careful attention to the following “6 rules” for cleanliness: |
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| Thoroughly clean all unions and the adjacent areas before disconnecting. |
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| Place parts that have been removed on a clean surface and cover them over. Do not use fluffy 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 stored loose (e.g. in tool boxes etc.). |
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| When 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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| Also ensure that no diesel fuel runs on to the coolant hoses. If necessary, the hoses must be cleaned immediately. Damaged hoses must be renewed. |
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