VW Passat B5

since 1996 release

Repair and operation of the car

Foltsvagen Passat B5
+ Maintenance instruction
+ 1. Maintenance
+ 2. Engines
+ 3. Cooling system
- 4. Fuel system
   4.2. Fuel pump / fuel level sensor
   4.3. The fuel filter on models with petrol engines
   4.4. Adjustment of a cable of an accelerator (petrol engine)
   4.5. Additional adjustment (automatic transmission)
   - 4.6. Fuel system of the diesel engine
      4.6.2. General information
      4.6.3. Check of system of preliminary heating of the diesel engine
      4.6.4. Check of candles of an incandescence
      4.6.5. Glow plugs
      4.6.6. System of heating of fuel
      4.6.7. Fuel nozzles
      4.6.8. Main malfunctions of a control system of the engine
+ 5. Engine management
+ 6. Exhaust system
+ 7. Transmission
+ 8. Running gear
+ 9. Steering
+ 10. Brake system
+ 11. Body
+ 12. Heating, ventilation
+ 13. Electric equipment

4.6.6. System of heating of fuel


For increase in fluidity of diesel fuel at low temperatures of external air it needs to be warmed up. Heating is made by additional pumping of fuel which comes back from the fuel pump of high pressure to the fuel tank. Passing through the fuel pump of high pressure fuel is warmed up. The adjusting valve which operates a fuel stream depending on temperature of the fuel filter is installed in the pipeline of return of fuel. At a temperature of external air below +15 °C the fuel which is warmed up by the fuel pump of high pressure goes to the fuel filter. At air temperature above +31 °C the adjusting valve directs the fuel which is warmed up by the fuel pump of high pressure directly in the fuel tank. The adjusting valve is located from the top party of the fuel filter.

If the engine is not started at low air temperature in connection with jelling of diesel fuel, perform the following operations:

  – remove the fuel filter and warm up its ferry;
  – replace the fuel filter with new;
  – warm up the injection device, pouring over it hot water.