This is provided by the fuel filter. Dirt particles settle on the filter element. And below, in the free space of the filter, water can settle - it is heavier than fuel. For all diesel models, the fuel filter must be changed every 90,000 km.
Replacing the fuel filter
"90,000 km every 4 years"
1. Disconnect the vacuum hose from the brake booster.
Fig. 4.90. Fuel filter: 1 – fuel filter; 2 – fuel supply; 3 – protective plate; 4 – bolt of fine fuel filter; 5 – fine fuel filter
2. Unscrew the filter cartridge (Fig. 4.90) using a strap wrench (for example, for an oil filter), unscrew the large nut on top.
3. Remove the cartridge with the filter (do not throw away with household waste! Dispose of in special places).
4. Insert the new cartridge and screw with the new seal.
5. Tighten the bolt and chuck.
Checking the fuel coarse filter
Depending on the operating conditions, it is necessary to check the coarse filter for damage every 30,000 km and clean it if necessary. Usually it is sufficient to replace the coarse and fine filters every 90,000 km or every 4 years.
Original article is on the portal [MERCEDESMAN]
"90,000 km every 4 years"
Fig. 4.91. Location of the coarse filter
1. Unscrew the bolt on the coarse filter (Fig. 4.91).
2. Bend back the mounting plate and disconnect the fuel supply pipe.
3. Remove the filter from the fuel filter housing.
4. Wash or carefully blow out the dirty filter.