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Engine control unit J623 > < Fuel supply system components

Leon Mk1

checking the seal
checking the seal
  WARNING
Fuel system is under pressure! Wear safety goggles and appropriate clothing to avoid injury and contact with skin. Before loosening hose connections, wrap a cloth around the connection. Then eliminate the pressure by carefully separating the pipe.
Test requirements
l  Fuel pressure must be correct, check: → Chapter
   
–  Pull off connectors -arrows- from all the injectors.
–  Unclip the cable harness from the injectors.
–  Remove the fuel rail from the intake manifold.
–  Remove the fuel rail together with the injectors from the intake manifold. (The fuel pipes remain connected).
–  Remove cover from fuse holder.
  N15-10082
–  Remove fuse F34 for the fuel pump in the fuse holder. Fuse allocation → Current flow diagrams, Electrical fault finding and Fitting locations
–  Connect remote control -VAG 1348/3A- with adapter cable -SAT 1348/3-3- to lower contact to fuel pump and battery positive (+).
  Note
The following operation is to make the fuel pump run when the engine is stopped.
–  Place a small recipient below the injector to be checked.
–  Operate the remote control -VAG 1348/3A- for one minute
–  Checking injectors for leakage (visual check). Only 1 to 2 drops per minute may emit from each valve when fuel pump is running.
If the fuel loss is greater:
–  Replace the defective injector → Chapter.
  Note
Always renew seals.
  E20-10032

Engine control unit J623 > < Fuel supply system components