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Test intake manifold changeover > < Testing injection rate

Octavia Mk2

Test fuel pressure regulator and holding pressure
Test fuel pressure regulator and holding pressure
Special tools and workshop equipment required
t  Pressure gauge, e.g. -V.A.G 1318-
t  Adapter, e.g. -V.A.G 1318/9-
t  Adapter set, e.g. -V.A.G 1318/17-
t  Double connection piece -V.A.G 1318/23-
t  Remote control -V.A.G 1348/3 A-
  Note
t  The fuel pressure regulator regulates the fuel pressure to approx 0.4 MPa (4 bar).
t  The fuel pressure regulator is located on the fuel tank.
t  Observe safety measures and rules of cleanliness when working on the fuel supply → Chapter.
  WARNING
The fuel system is under pressure! Before opening the system lay cleaning cloths around the connection point. Reduce pressure by carefully releasing the connection point.
   
–  Separate the connector of the fuel feed line -3- and collect the fuel with flows out with a cloth.
  Note
Press in the securing ring in order to unlock the fuel line.
  S24-0602
–  Connect pressure gauge with adapter -V.A.G 1318/9- and with adapter set -V.A.G 1318/17- to fuel filter -1- and to fuel feed line -2-.
–  Open shut-off cock of the pressure gauge. Lever points in direction of flow.
–  Venting air from the fuel system → Chapter.
–  Start engine and run in idle.
–  Measure fuel pressure.
Specified value: approx. 0.4 MPa (4 bar).
If the specified value is not reached:
–  Switch off ignition.
–  Check the fuel flow rate of the fuel pump → Chapter.
–  If the fuel delivery unit is o.k., replace the fuel pressure regulator.
If the specified value is reached:
–  Switch off ignition.
–  Check for tightness and holding pressure (complete system). To this end observe the pressure drop on the pressure gauge. After 10 minutes there must still be at least 0.3 MPa (3 bar) present.
If the holding pressure drops below 0.3 MPa (3 bar):
–  Start engine and run in idle.
  S24-0606
–  After the pressure has built up, switch ignition off. At the same time close the shut-off cock of the pressure gauge (lever at right angles to direction of flow) -arrow-.
–  Observe pressure drop (engine side) on pressure gauge.
If the pressure again drops:
–  Check the line connections, the O-rings on the fuel rail and the injection valves for tightness → Chapter.
–  Inspect pressure measuring device for leaks.
  Note
Before removing the pressure gauge, place the cloth again around the line connection.
If the pressure does not drop:
–  Check the line connections to the fuel tank and the non-return valve of the fuel delivery unit → Chapter.
–  If the non-return valve is o.k., replace the fuel pressure regulator.
–  Venting air from the fuel system → Chapter.
  S24-0604

Test intake manifold changeover > < Testing injection rate