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Check the fuel system for tightness > < Testing the pressure of the high pressure pump

Fabia Mk2

Testing the return flow quantity on the high pressure pump
Testing the return flow quantity on the high pressure pump
Special tools and workshop equipment required
t  Adapter, e.g. -VAS 6551/5-2-
Test condition
l  The tests on the low-pressure side of the fuel line were carried out and no complaints arose.
l  The fuel tank is filled with clean fuel according to the valid standards.
l  The starter is operated at a starter speed of ≥ 230 rpm.
Work procedure
  Note
t  Safety precautions when working on the fuel supply system → Chapter.
t  Observe rules for cleanliness → Chapter.
   
–  Detach the fuel return-flow line -2- from the high pressure pump.
–  Connect the adapter -VAS 6551/5-2- with the drain of the high pressure pump.
  N23-10261
–  Hold the adapter -VAS 6551/5-2- in a suitable vessel in order to check the return flow quantity.
Measure at a starter speed of ≥ 230 rpm.
  N23-10481
–  Disconnect plug at fuel dosage valve -N290--A-.
If the return flow quantity was measured, proceed with the test of the parts at the fuel distributor:
t  Check fuel pressure regulating valve -N276- → Chapter.
t  Check fuel pressure sender -G247- → Vehicle diagnostic tester.
If no return flow quantity was measured, replace the high pressure pump:
t  Fabia II, Roomster, Rapid → Chapter.
t  Octavia II, Superb II, Yeti → Chapter.
  N20-10721

Check the fuel system for tightness > < Testing the pressure of the high pressure pump