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Check fuel pressure with pressure gauge VAS 6550 > < Inspecting proper operation and power supply

Octavia Mk2

Check fuel pressure with pressure gaugeV.A.G 1318
Check fuel pressure with pressure gauge -V.A.G 1318-
l  The function of the fuel pump was checked → Chapter.
  Note
t  Safety precautions when working on the fuel supply system → Chapter.
t  Rules of cleanliness when working on the fuel supply system → Chapter.
   
–  Disconnect the feed line -2- (press in the securing ring to the top) and catch the fuel which flows out with a cleaning cloth.
  S10-0213
–  Install the pressure gauge -V.A.G 1318 - with the adapter set -V.A.G 1318/17A- instead of the fuel feed line.
–  Open shut-off cock of the pressure gauge. The lever then points in position -A-.
–  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.
l  Specified value: 0.4 ... 0.7 MPa (4 ... 7 bar)
If fuel line is o.k.:
–  Test holding pressure → Chapter.
If the specified pressure is exceeded:
–  Check the return line between the fuel filter and fuel pump for kinks and blockages.
If no fault is found:
–  Pressure limiting valve in the fuel filter defective, replace the fuel filter.
If the measurement is less than the specification:
  N20-10428
–  Check the fuel pressure before the fuel filter. For this step connect the pressure gauge -V.A.G 1318- with the adapter set -V.A.G 1318/17A- between the fuel filter and the fuel feed line.
–  Open shut-off cock of the pressure gauge. Lever points in direction of flow.
–  Start engine and run in idle.
  Caution
The shut-off cock must only be closed slowly. At a fuel pressure of 0.8 MPa (8 bar), the shut-off cock must be immediately opened, in order to avoid a damage of the pressure gauge.
  S20-0253
–  Slowly close the shutoff cock of the pressure measuring device. The pressure must rise to at least 0.7 MPa (7.0 bar). If the 0.7 MPa (7.0 bar) is reached, immediately open the shut-off cock again!
If the pressure has risen:
–  Fuel pump O.K., pressure limiting valve in the fuel filter defective, replace the fuel filter.
If the pressure does not rise:
–  Fuel pump defective, replace fuel delivery unit → Chapter.
  S20-0254

Check fuel pressure with pressure gauge VAS 6550 > < Inspecting proper operation and power supply