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Active charcoal tank system > < Safety precautions when working on fuel supply system

Leon Mk1

Fuel pressure reduction in the high-pressure system
Fuel pressure reduction in the high-pressure system
  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 to do so is described below.
   
–  Disconnect the connector of the fuel pressure regulating valve -N276--arrow-.
–  Let the engine idle for approx. 10 seconds.
  Note
t  If the connector of the fuel pressure regulating valve -N276- is disconnected while the engine is idling, the pressure in the high-pressure system drops to approx. 6 bar.
t  Once the pressure has been reduced, the high-pressure system must be opened, seeing as the fuel pressure may increase again due to heating.
–  Switch ignition OFF.
  WARNING
The fuel piping is under pressure. Wear safety goggles and appropriate clothing to avoid injury and contact with skin. Before opening the high-pressure system, place a cloth around the connection.
–  Affix a clean cloth at the liaison office, affix and carefully open, so that the residual pressure of about 6 bar outlet ends fuel is recorded.
–  Once the work has been completed, read out the event memory and erase all faults in memory due to disconnecting the connector.
  Note
After deleting the event memory, the readiness code must be generated: → Vehicle diagnostic tester„Guided Functions“.
  N20-10282

Active charcoal tank system > < Safety precautions when working on fuel supply system