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Checking components > < Fuel supply unit

Leon Mk1

Safety measures
Safety measures
  WARNING
Fuel supply pipes are pressurised. Before detaching the fuel supply pipes, place a cloth around the connection point. Then eliminate the pressure by carefully separating the pipe.
To prevent injuries to persons and/or damage to the fuel injection and ignition system, the following must be noted:
t  Do not touch or remove the ignition cables with the engine running or idling.
t  The ignition must be switched off before connecting or disconnecting injection or ignition system wiring or tester cables.
t  For safety reasons, if the battery terminals are not disconnected, fuse SC 34 on the left-hand side of the instrument panel must be removed from fuse holder before the fuel system is opened, seeing as the fuel pump can be activated by the door contact switch in the driver door. Fuse installation → Current flow diagrams, Electrical fault finding and Fitting locations
  Caution
When performing any fitting work, especially in the engine compartment, pay attention to the following due to the cramped conditions:
t  All the various lines (e.g. fuel, hydraulic system, active carbon filter system, coolant, refrigerant, brake fluid and vacuum pipes and hoses) and electrical wiring must be installed in their original positions.
t  To prevent damaging the hoses, ensure that all mobile or hot components are easily accessible.
Observe following if test and measuring instruments are required during a test drive:
t  Testers and measuring instruments must always be secured to the rear seat and operated by a 2nd person from this location.
If test and measuring instruments are operated from front passenger's seat and the vehicle is involved in an accident, the person sitting in this seat could be seriously injured when the airbag is triggered.
If the engine is to be turned at starter speed without starting:
–  Remove the fuses in order to cut off the power supply to the injectors and the ignition coils. Fuse installation → Current flow diagrams, Electrical fault finding and Fitting locations
  Note
When removing the fuses, the power supply of the injectors and the ignition coils is interrupted.
–  Consult fault memory; if necessary, repair any faults and then erase fault memory → Vehicle diagnosis, testing and information system VAS 5051“guided fault finding”
–  After deleting the fault memory, the conformance code must be generated.
   

Checking components > < Fuel supply unit