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Audi Workshop Service and Repair Manuals

Engine control unit > < Injectors
High-pressure pump - exploded view
High-pressure pump - exploded view
  Caution
The high-pressure fuel pump has very close tolerances and must not be allowed to run without fuel. To prevent this and to enable the engine to start quickly after parts have been renewed, it is important to observe the following:
t  If components of the fuel system between the fuel tank and the high-pressure pump are removed or renewed, the first fuel filling operation must be performed.
t  If a fuel pump, fuel line (between fuel tank and high-pressure pump) or fuel filter is removed or renewed, the fuel system must be bled before the engine is started for the first time.
t  If the high-pressure pump is removed or renewed, the fuel system must be bled before the engine is started for the first time.
Performing first fuel filling after installing high-pressure pump → Chapter
   
1 - Bolt
q   M6: 9 Nm
q   M8: 23 Nm
2 - Front bracket for high-pressure pump
3 - Bolt
q   9 Nm
4 - Protective plate
5 - Union nut for high-pressure pipe
q   Tightening torque → Chapter
6 - High-pressure pump
  Caution
t  Prerequisites for fitting toothed belt:
t  TDC of crankshaft → Fig. and TDC of camshaft → Fig. must be aligned.
t  In addition, toothed belt sprocket for high-pressure pump must be locked in position using locking tool -T40135-. This is important to prevent oscillation of toothed belt. → Fig.
t  The high-pressure pump must first be filled with fuel before the engine is started. The high-pressure pump must not be allowed to run while still empty. First fuel filling → Chapter
t  Observe rules for cleanliness when working on the injection system → Chapter.
q   After renewing high-pressure pump or fuel pressure regulating valve -N276-, learnt values must be re-adapted; see „Guided Functions“ in → Vehicle diagnostic tester
q   Removing toothed belt sprocket for high-pressure pump using puller -T40064- → Fig.
q   Removing and installing → Chapter
7 - Hose clip
q   Use only correct type of hose clips (as original equipment) → Parts catalogue
8 - Fuel supply hose
9 - Fuel return hose
q   Fuel return line must not be kinked, damaged or clogged
10 - Hose clip
q   Use only correct type of hose clips (as original equipment) → Parts catalogue
11 - Union nut for high-pressure pipe
q   Tightening torque → Chapter
12 - Bolt
q   23 Nm

   
TDC of crankshaft -1-
  A13-10046
TDC of camshaft -arrow-
  A23-10608
Locking tool -T40135- for toothed belt sprocket for high-pressure pump
  A23-10686
Pulling off toothed belt sprocket for high-pressure pump
–  Use puller -T40064- to pull off belt sprocket for high-pressure pump.
  A13-10032

Engine control unit > < Injectors