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Removing and installing high-pressure pump > < High-pressure pump

Leon Mk2

High-pressure pump - exploded view
High-pressure pump - exploded view
  WARNING
The injection system is sub-divided into a high pressure system (max. approx. 120 bar) and a low pressure system (approx. 6 bar).
Prior to opening the high-pressure area, e.g. when removing the high-pressure pump, fuel rail, injectors, a fuel line, or the fuel pressure sender -G247-, the fuel pressure in the high-pressure area must be reduced to a residual pressure of approx. 6 bar. The appropriate procedure is described in the chapter on releasing pressure in the high-pressure section → Chapter.
   
1 - Roller tappet
q   Lightly coat with engine oil when installing.
2 - O ring
q   Replace
q   Lightly coat with engine oil when installing.
3 - High-pressure pump with fuel pressure regulating valve -N276-
  Caution
Only grasp high-pressure pump on housing when removing and installing!
When the high-pressure piston spring package loosens the high-pressure pump will leak and must be replaced.
4 - 20 Nm
q   Tighten bolts evenly.
5 - Joint mouth
q   High-pressure.
6 - Union nut, 18 Nm
q   Observe safety precautions → Chapter.
q   Counterhold when loosening connection to high-pressure pump.
7 - Fuel hose
q   Low-pressure.
q   With spring-type clip.
8 - Joint mouth
q   Low-pressure.

   

Removing and installing high-pressure pump > < High-pressure pump