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Test fuel pressure regulator and holding pressure > < Check power consumption

Octavia Mk2

Checking the non-return valve of the fuel delivery unit
Checking the non-return valve of the fuel delivery unit
–  Removing rear seat bench → Body Work; Rep. gr.72.
–  Remove the cover from the fuel delivery unit.
  Note
For vehicles with auxiliary heating, the plug connection for the dosing pump -V54- must be disconnected additionally.
   
–  First of all check the plug connection -arrow- for correct fit. To do so, pull on the plug connection without pressing the catch. If the plug connection was not correctly positioned, this could cause a fault.
–  Disconnect the plug connection -arrow- from the fuel delivery unit.
–  Check the contacts at the plug and at the fuel delivery unit for damage.
  N20-10623
–  Connect the adapter for measuring method/DSO (5-pin) -VAS 5565- to the plug and to the fuel delivery unit.
–  Connect the remote control -V.A.G 1348/3A- to the adapter -VAS 5565- and to the battery positive (+).
  WARNING
The fuel feed line is pressurized! Place cleaning cloths around the connection point before detaching hose connections. Reduce pressure by carefully removing the hose.
  N20-10422
–  Disconnect the feed line -1- from the fuel filter inlet.
  Note
Press in the securing ring in order to unlock the fuel line.
–  Connect pressure measuring device with adapter set -V.A.G 1318/17- as shown.
–  Fit adapter -V.A.G 1318/1- onto adapter -V.A.G 1318/11- of pressure measuring device and hold in a measuring vessel.
–  Close the shut-off valve of the pressure measuring device -V.A.G 1318- (set the lever at right angles to the direction of flow of fuel -B-).
–  Activate the remote control with short pauses in between until an overpressure of 0.4 MPa (4 bar) is built up.
  WARNING
Danger of liquid spraying out when opening the shut-off cock; hold the container in front of the free connection to the pressure gauge.
–  Lower an overpressure which has become too high by carefully opening the shut-off valve.
–  Observe pressure drop at pressure gauge. The pressure must not drop below 0,3 MPa (3 bar) after 10 minutes.
If the pressure still drops:
–  Check line connections for leaktightness.
If the lines are not found to be faulty:
–  Fuel pump defective, replace fuel delivery unit → Chapter.
  S20-0205

Test fuel pressure regulator and holding pressure > < Check power consumption