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Removing and installing high-pressure pump > < Checking fuel pressure and residual pressure (up to high-pressure pump)

A4 Mk3

High-pressure pump - exploded view
   
High-pressure pump - exploded view
1 - Fuel pressure sender for low pressure -G410-
q   15 Nm
2 - Seal
q   Renew
3 - Bolt
q   Hand-tighten in diagonal sequence, then tighten to 5 Nm
q   Final torque: 20 Nm
q   Do not tilt high-pressure pump
4 - High-pressure pump
q   With fuel metering valve -N290-
q   To loosen and tighten fuel pipes, counterhold at fuel pipe connection
q   Re-tighten threaded connections for fuel pipes before installing fuel pipes
q   Removing and installing → Chapter
q   Do not dismantle
5 - Threaded connection
q   27 Nm
6 - Hose clip
q   Renew; use correct type of hose clips (as original equipment) → Parts catalogue
7 - Fuel supply hose
q   Low-pressure section
8 - High-pressure fuel pipe
  WARNING
The fuel system operates at extremely high pressure. This can cause injury.
The pressure in the high-pressure section of the injection system must be reduced to a residual pressure prior to opening the system.
q   Reducing fuel pressure in high-pressure section of injection system → Chapter
q   To loosen and tighten union nut, counterhold at connection on high-pressure pump
q   Before installation, re-tighten connection on high-pressure pump
q   Installing → Fig.
9 - Gasket
q   Renew
10 - Bolt
q   9 Nm
11 - Hall sender -G40-
12 - Bolt
q   9 Nm
13 - O-ring
q   Renew
q   Lubricate lightly with clean engine oil before installing
14 - Housing
15 - Roller tappet
q   Lubricate lightly with clean engine oil before installing
16 - O-ring
q   Renew
q   Lubricate lightly with clean engine oil before installing

   
Guard plate for high-pressure pipe - tightening torque
–  Tighten bolts -arrows- securing guard plate -1-.
t  Tightening torque: 9 Nm
  A24-10411
Installing high-pressure pipe
–  Tighten union nut on high-pressure pipe hand-tight initially.
–  Ensure that high-pressure pipe is not under tension.
–  To tighten union of high-pressure pipe at high-pressure pump, use torque wrench -V.A.G 1331- with ratchet -V.A.G 1331/1- and socket, 14 mm -3150-.
t  Tightening torque for union nut on high-pressure pipe: 25 Nm
  A23-0225

Removing and installing high-pressure pump > < Checking fuel pressure and residual pressure (up to high-pressure pump)