| Even small amounts of dirt can cause malfunctions. When working on the fuel supply system and injection system, pay careful attention to the following basic rules: |
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| Carefully clean connection points and the surrounding area with engine cleaner or brake cleaner and dry thoroughly before opening. |
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| Seal off open lines and connections with clean plugs or sealing caps immediately. |
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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 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. Do not move the vehicle unless absolutely necessary. |
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| Protect unplugged electrical connectors against dirt and moisture and make sure connections are dry when attaching. |
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