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Rules of cleanliness to observe when working on the fuel supply system > < Safety precautions when working on the fuel supply system

Octavia Mk2

Release pressure in the high pressure area of the fuel system
Release pressure in the high pressure area of the fuel system
  WARNING
t  The injection system consists of a high pressure part (max. pressure of 12 MPa = 120 bar) and a low pressure part (pressure of approx. 0.6 MPa = 6 bar).
t  Before opening the high pressure area, e.g. removing the high pressure pump, the fuel distributor, the injection valves, the fuel pipes or the fuel pressure sender -G247-, the fuel pressure in the high pressure area with a remaining pressure of approx. 0.6 MPa (6 bar) must be reduced. The procedure for this is described below.
–  Connect the → Vehicle diagnosis, testing and information system VAS 5051 and carry out the targeted function “remove high fuel pressure”.
–  Switch off ignition.
   
–  For safety reasons before opening the fuel system disconnect the plug -3- from the fuel pump control unit.
  WARNING
The fuel lines are pressurized! Wear safety goggles and safety clothing, in order to avoid injuries and skin contact with fuel. Before opening the high pressure part lay cleaning cloths around the connection point.
–  Now lay a clean cleaning cloth around the connection point and carefully open it up, in order to reduce the remaining pressure of approx 0.6 MPa (6 bar). Collect the fuel which flows out.
  Note
t  Interrogate the fault memory for the engine control unit at the end of the following work and delete all the fault entries.
t  If the fault memory was erased, the readiness code must be generated → Vehicle diagnosis, testing and information system VAS 5051.
  S20-0159

Rules of cleanliness to observe when working on the fuel supply system > < Safety precautions when working on the fuel supply system