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Checking fuel pressure in high-pressure section > < Cleaning throttle valve moduleJ338

Golf Mk5

Assembly overview - high-pressure pump
Assembly overview - high-pressure pump
  WARNING
The injection system consists of a high-pressure section (maximum approx. 120 bar) and a low-pressure section (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   Renew.
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 - 8 Nm
5 - Connection
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 - Connection
q   Low-pressure.

   

Checking fuel pressure in high-pressure section > < Cleaning throttle valve moduleJ338