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Check fuel flow rate > < Check fuel pressure

Octavia Mk2

Test holding pressure
Test holding pressure
   
l  Fuel pressure O.K. and pressure gauge -V.A.G 1318- connected in the engine compartment → Chapter.
–  Switch the ignition on and off so often until the fuel pressure on the pressure gauge does no longer rise.
–  Read off fuel pressure on the pressure gauge. Specified value: 0.35...0.5 MPa (3.5...5.0 bar).
–  Observe pressure drop at pressure gauge.
   The pressure must not drop below 0.3 MPa (3.0 bar) after 10 minutes.
If the pressure still drops:
–  Switch the ignition on and off so often until the fuel pressure on the pressure gauge does no longer rise.
  S20-0252
–  Immediately close the shutoff cock of the pressure measuring device. The lever then points in the position -B-.
If the pressure again drops:
–  Check the low pressure pipe to the high pressure pump for tightness.
If no fault is found:
–  Replace high pressure pump → Chapter.
Now the pressure does no longer drop:
–  Check the fuel line to the fuel filter for tightness.
If the fuel line is not found to be faulty:
  S20-0252
–  Check the non-return valve in the fuel delivery unit. For this step connect the pressure measuring device -V.A.G 1318- with the adapter -V.A.G 1318/17- between the fuel filter and the fuel feed line.
–  Open shut-off cock of the pressure gauge. Lever points in direction of flow.
–  Switch the ignition on and off so often until the fuel pressure on the pressure gauge does no longer rise.
–  Read off fuel pressure on the pressure gauge.
   Specified value: 0.35 ... 0.5 MPa (3.5 ... 5.0 bar)
  S20-0253
–  Immediately close the shut-off cock of the pressure measuring device after the pressure has built up.
–  Observe pressure drop at pressure gauge.
   The pressure must not drop below 0.3 MPa (3.0 bar) after 10 minutes.
If the pressure drops, the non-return valve in the fuel pump is defective:
–  Replace fuel delivery unit → Chapter.
If the pressure does not drop, the pressure limiting valve in the fuel filter is defective:
–  Replace fuel filter.
  S20-0254

Check fuel flow rate > < Check fuel pressure