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Carry out the vacuum test of the injection units > < Check fuel pressure regulating valveN276

Octavia Mk2

Checking return flow quantity of injection units
Checking return flow quantity of injection units
Test condition
l  Engine does not start
  Note
t  Leaking switch valves in the injection units can cause irregular engine running or prevent the engine from starting.
t  In order to check the switch valves for contamination and thus also for increased leakage, a vacuum test can be carried out besides the „classic“ measurement of the return flow quantity → Chapter.
Test sequence
  Note
t  Safety precautions when working on the fuel supply system → Chapter.
t  Observe rules for cleanliness → Chapter.
   
–  Disconnect plug at fuel dosage valve -N290--A-.
–  Collect the fuel which flows out with a cleaning cloth.
  N20-10721
–  Remove the return-flow connection -3- of the injection units at the fuel drain pipe.
For vehicles Fabia II, Roomster, Octavia II, Superb II, Yeti
  N20-10829
–  Close the open connection at the pipe for the fuel return-flow line with a plug -arrow-.
For vehicles Rapid
  N23-10478
–  Close the open connection at the pipe for the fuel return-flow line with a plug -arrow-.
Continued for all vehicles
–  When starting the engine, measure at a starter speed of ≥ 230 rpm.
l  Specified value of return flow quantity: 0 ml
l  A drop-leakage is permissible
l  If a volume flow can be measured, at least one injector is defective
–  Carry out the vacuum test of the injection units → Chapter.
  N23-10479

Carry out the vacuum test of the injection units > < Check fuel pressure regulating valveN276