| Rules for cleanliness when working on the auxiliary heater and the fuel system |
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| Thoroughly clean all connections and adjacent areas before disconnecting. |
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| Place parts that have been removed on a clean surface (use sheeting or paper, but no fluffy cloths) and cover. |
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| Carefully cover opened components or seal if the repair cannot be carried out immediately. |
| Install clean parts only: |
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| Remove genuine parts from their packages only immediately before installing them. |
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| Do not use any parts which have not been stored in their packaging (e.g. in a tool box). |
| If fuel line has been opened: |
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| do not work with compressed air. |
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| Do not switch auxiliary heater on. |
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