Mercedes S-class W202

1993-2000 of release

Repair and car operation

Mercedes W202
+ 1.2. The general data
+ 2. Maintenance service
+ 3. Engines
+ 4. Greasing system
+ 5. Cooling system
+ 6. Heating, ventilation
+ 7. Ignition system
- 8. Fuel system
   - 8.1.1. Introduction
      8.1.2. A fuel tank
      8.1.3. The gauge of level of fuel
      8.1.4. The fuel pump
      8.1.5. The fuel filter
      8.1.6. The air filter
      8.1.7. A cross-section pipe of the air filter
      8.1.8. An inlet gas pipeline
      8.1.9. A cable of gas / the lever throttle заслонки (DB)
      8.1.10. A cable of management of gas (DB)
      8.1.11. A contour of fuel of the diesel engine
      8.1.12. Prestarting heating of diesel fuel
      8.1.13. The fuel thermostat
      8.1.14. The hydrovalve case
      8.1.15. A cable of gas / the lever throttle заслонки (ДД)
      8.1.16. A cable of management of gas (ДД)
   + 8.2. System of injection of petrol engines
   + 8.3. System of injection and a food of diesel engines
   + 8.4. System of release of the fulfilled gases
+ 9. Transmission
+ 10. A running gear
+ 11. A steering
+ 12. Brake system
+ 13. A body
+ 14. An electric equipment
+ 14.2. Electroschemes

8.1.12. Prestarting heating of diesel fuel

To guarantee normal fluidity of diesel fuel and thanks to it to prevent corking топливопроводов and filters, in particular at the big colds, fuel is preliminary warmed up according to an ambient temperature.

The toplivopodkachivajushchy pump sucks in fuel from a tank through the fuel filter of rough clearing. Thus diesel fuel directly proceeds before топливоподкачивающим the pump of the fuel thermostat which depending on fuel temperature defines degree of prestarting heating of fuel.

The engine in volume of 2,0 l

The engine in volume of 2,0 l (the party of low pressure)

1. The pump of atomizers
3. The fuel pump
15. The perepusknoj valve
30. Atomizers
43. The filter of rough clearing of fuel
50. A hose oil plum
63. A fuel tank
73А. A drosselirujushchee aperture in the top part of the fuel filter
86. The fuel thermostat. The thermostat is closed, fuel is not warmed up.
89. The device with the central fastening
148. The fuel heat exchanger
A – the Admission from a tank
B – the Pipeline to the fuel pump
C – the Submitting line to the heat exchanger
D – Inflow from the heat exchanger
E – the Supply of a cooling liquid
F – the Party обегания a cooling liquid

For prestarting heating diesel fuel arrives from the thermostat through a line submitting diesel fuel () to the heat exchanger (148) on a fuel submitting line (), through a drain of diesel fuel (D) again back in the thermostat and therefrom by means of the fuel pump in the fuel filter.

If fuel temperature more low 18 C, the thermostat is completely open also all quantity of fuel flows through the heat exchanger. At temperature from 18 to 30 C the mixed mode prevails, i.e. Fuel partially flows through the heat exchanger and is partially direct to топливоподающему to the pump. At temperature above 30 C fuel giving to the heat exchanger from the thermostat stops.

The thermostat is established outside on the heat exchanger. And – giving of fuel from a fuel tank, In – the inlet pipeline to the fuel pump, Е – an input of a cooling liquid, F – an exit of a cooling liquid.

Engines in volume of 2,2/2,5 l

Fuel flows in front of the fuel filter through the heat exchanger which is screwed in sideways in a cylinder head. In the heat exchanger above насажен a thermoelement which depending on fuel temperature directs its stream in full or in part through the heat exchanger: from 18 C to 30 C the mixed mode, over temperature 30 C – without prestarting heating.