Precautionary measures
Do not use open flames, do not smoke, do not bring hot or very hot parts to the work area to avoid fire. Keep a fire extinguisher at hand.
Ensure good ventilation of the workplace - fuel vapors are very toxic.
The fuel system is under pressure. When unscrewing the fuel system connections, fuel may splash out. It should be collected with a rag. When working, use protective glasses.
Before loosening connections, thoroughly clean them and the surrounding area.
Place the removed parts in a clean place and cover them with film or paper.
Open parts must be carefully covered or capped while repairs are being made.
Install only clean parts.
Remove spare parts from packaging immediately before installation.
Do not use parts that have been stored in improper conditions or unpacked.
If possible, do not use compressed air or move the vehicle when parts of the fuel system are exposed.
Do not use silicone sealants. The sealant residues sucked in by the engine will not burn in it and will then damage the lambda probe (oxygen sensor).
Diesel fuel should not come into contact with the cooling system hoses, as they may be damaged. If fuel does spill, wipe it off with a damp cloth.