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High pressure pump with fuel pressure regulating valveN276 Removing and installing > < Check the fuel pressure and retaining pressure in front of the high pressure pump: check

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High-pressure pump with fuel pressure regulating valveN276 - Assembly overview
High-pressure pump with fuel pressure regulating valve -N276- - Assembly overview
  WARNING
The injection system is sub-divided into a high pressure system (max. approx. 120 bar) and a low pressure system (approx. 6 bar).
Before opening the high-pressure system, e.g. to remove the high-pressure pump, the fuel rail, the injectors, the fuel hoses or the fuel pressure sender -G247-, the fuel pressure in the high-pressure system must be reduced to approx. 6 bar. The procedure is described in the chapter "Reduction of high pressure system pressure" → Chapter.
   
1 - Bolt
q   Tightening torque: 15 Nm
2 - Joint mouth
q   Low pressure
3 - Spring-type hose clip
q   Removing and installing with the pliers -T20174-
4 - Fuel hose
q   Low pressure
q   With spring clip
5 - Union nut
q   Tightening torque: 18 Nm
q   Always follow safety precautions → Chapter.
q   When removing the connection hose, it must be retained at the high-pressure pump side
6 - Joint mouth
7 - High-pressure pump with fuel pressure regulating valve -N276-
q   An electric fuel pump (fitted in fuel tank) supplies fuel to the mechanical high-pressure pump
q   When installing the high-pressure fuel pump, it is essential to ensure that no dirt enters the fuel system.
q   Fuel pipes must be free of tension when installed.
q   When the plug connector is separated, the high pressure pump switches to the mode with maximum supply.
q   removing and fitting → Chapter
8 - Tappet with roller
q   Before mounting, lightly grease with engine oil
9 - O ring
q   replace
q   Before mounting, lightly grease with engine oil

   

High pressure pump with fuel pressure regulating valveN276 Removing and installing > < Check the fuel pressure and retaining pressure in front of the high pressure pump: check