When working on the fuel system, be sure to observe the following rules:
Thoroughly clean the connections and their surroundings before removing them.
Place removed parts in a clean place and cover. Use film and paper, do not use lint-free rags.
Exposed elements must be carefully closed or covered if repairs are not carried out immediately.
Remove spare parts from packaging just before installation. Install only clean parts.
Do not install parts that were not in the package (e.g. taken from a toolbox).
With an open fuel system, if possible, do not work with compressed air. If possible, do not move the car.