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Pressure retention valve in fuel return line: check > < Reverse flow quantity of the injectors (piezo injectors) check when the engine is running

Leon Mk2

Reverse flow quantity of the injectors (piezo injectors) check at starter cranking speed
Reverse flow quantity of the injectors (piezo injectors) check at starter cranking speed
If it is not possible to start engine, the return flow rate of injectors can be checked with the starter motor speed.
Consult the equivalence table for tools and equipment according to applicability among Seat / VW / Audi / Skoda → Chapter.
Special tools and workshop equipment required
   
t  Injection rate tester -V.A.G 1348/2 B- (is required twice), see equivalent → Anchor
t  4 lengths of hose (made up in the workshop) to fit return line connections on injectors
  WARNING
t  Always read rules for cleanliness and instructions for working on fuel system → Chapter.
t  Always follow these rules for cleanliness and instructions before starting work and while working on the fuel system.
Each injector normally has a relatively low return flow rate. If the return flow rate at one injector is relatively high compared to the other injectors, that injector is probably defective.
  W00-0614
–  Remove the engine cover upwards -arrows-.
–  Remove the sound insulation from the injector valves.
–  Clean all return line connections (with commercial cleaning solution etc.) before removing.
–  Dry all components after cleaning.
  E10-10085
–  Separate the connections of the return run lines on the injectors; for this purpose, press both brackets downwards and pull the release bolts upwards at the same time -arrow-.
  Note
No dirt must be allowed to get into the disconnected return lines or the open connections on the injectors.
  N15-10404
–  Unplug the connector -5- for the fuel pressure regulation valve -N276-.
  Note
This prevents fuel from being injected when operating starter.
–  Connect 4 hoses onto return line connections of all 4 injectors.
–  Run the 4 hoses into injection rate comparison meter -V.A.G 1348/2 B-.
–  Operate starter three times. (Wait approx. 20 seconds each time after operating starter to prevent it from overheating.)
l  Specification of return flow rate: 0 ml
–  If fuel comes out of one injector, that injector must be renewed.
–  Again connect the plug of the control valve for fuel pressure -N276-.
–  Erase fault in fault memory using diagnostic tester.
–  Check fuel system for leaks → Chapter.
  N23-10226

Pressure retention valve in fuel return line: check > < Reverse flow quantity of the injectors (piezo injectors) check when the engine is running