| Rules for cleanliness and instructions for working on fuel system |
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| If the battery is not disconnected, the fuse for the fuel pump control unit -J538- must be removed as a precautionary measure before opening the fuel system because the fuel pump will otherwise be activated by the contact switch on the driver's door. |
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| The fuel system is pressurised. The fuel pressure in the high-pressure section of the injection system must be reduced to a residual pressure prior to opening; for procedure see → Chapter. |
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| The connection must be opened immediately after reducing the pressure; wrap a cloth around the connection and allow the residual pressure (approx. 7 bar) to dissipate. |
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| Even small amounts of dirt can cause malfunctions. For this reason, please observe the following rules when working on the fuel supply system and injection system: |
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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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| Plug open lines and connections with suitable protective 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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| 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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