Parking/Auxiliary Heater And Fuel System Clean Working Conditions

WARNING: This page is about a different car, the 2017 Volkswagen Beetle. However, it is still accessible from the selected car via links, so may be relevant.

Follow these "rules" when working on the fuel supply/injection system:

Thoroughly clean the connection points and the surrounding area before loosening.
Place the removed parts on a clean surface and cover them. Only use lint-free cloths.
Carefully cover or seal opened components if the repair is not performed immediately.
Only install clean parts: remove the replacement parts from their packaging just before installing them. Do not use parts that have been loosely stored or unpackaged (for example, in tool boxes etc.).
Do not work with compressed air when the system is open.
Do not move the vehicle.
Immediately seal off any open lines and connections with clean plugs, for example, taken from the Engine Bung Set:VAS6122 .
Protect any disconnected connectors from dirt and moisture, and only connect them when they are completely dry.