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Checking holding pressure with pressure gauge V.A.G 1318 > < Check fuel pressure with pressure gauge V.A.G 1318

Octavia Mk2

Check fuel pressure with pressure gaugeVAS 6550
Check fuel pressure with pressure gauge -VAS 6550-
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.
   
–  Remove the fuel feed line -2- (press in the securing ring to the top) and catch the fuel which flows out with a cleaning cloth.
  S10-0213
–  Connect the pressure gauge -VAS 6550- with adapter -VAS 6550/1- and -VAS 6550/2- to the fuel feed line.
–  Make sure that the discharge cock is closed and the shut-off cocks are opened.
–  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:
–  Check the fuel pressure before the fuel filter, to do so proceed as follows:
  N20-10628
–  Disconnect fuel feed line -arrow- at fuel filter.
  N20-10629
–  Connect the pressure gauge -VAS 6550- with adapter -VAS 6550/1- and -VAS 6550/2- between the fuel filter and the fuel feed line.
–  Make sure that the discharge cock is closed and the shut-off cocks are opened.
–  Start engine and run in idle.
  N20-10630
–  Slowly close the shutoff cock -A-.
l  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.
  S20-0349

Checking holding pressure with pressure gauge V.A.G 1318 > < Check fuel pressure with pressure gauge V.A.G 1318