skoda Workshop Repair Guides

Skoda Workshop Service and Repair Manuals

ABOUT US
Check the fuel flow rate of the fuel pump > < Checking function and voltage supply of fuel pump

Octavia Mk2

Test feed pressure of fuel pump
Test feed pressure of fuel pump
Special tools and workshop equipment required
t  Pressure measuring device -VAS 6551-
t  Hose adapter -VAS 6551/1-
t  Hose adapter -VAS 6551/2-
Test conditions
l  Battery voltage at least 12 V.
l  Fuses o.k. → Current flow diagrams, Electrical fault finding and Fitting locations.
l  All electrical consumers such as the light and rear window heater must be switched off.
Test sequence
  Note
t  Safety precautions when working on the fuel supply system → Chapter.
t  Observe rules for cleanliness → Chapter.
   
–  Detach the fuel feed line -2-, to do so press in the securing ring. Unlock the quick coupling and disconnect → Chapter.
–  Connect the pressure gauge -VAS 6551- with hose adapter -VAS 6551/1- and -VAS 6551/2- to the open ends of the fuel feed line.
–  Switch on the pressure gauge -VAS 6551- by pressing the button On/Off.
  A20-1118
–  Open the shut-off cocks „A“ and „B“ of the pressure gauge and close the shut-off cock „C“.
–  Start engine and run in idle.
–  Close the shut-off cock „B“ for maximum 15 seconds and during this period, read off the pressure at the pressure gauge -VAS 6551-.
l  Specified value: at least 0.05 MPa (0.5 bar).
–  If the injection pressure drops temporarily, replace the fuel delivery pump:
t  Octavia II with front-wheel drive → Chapter.
t  Superb II, Yeti and vehicles with four-wheel drive Octavia II → Chapter.
If the specified values are reached:
–  In the event of handling problems, replace the fuel filter, in order to avoid blockage of the fuel filter.
If the specified values are not reached:
For the vehicles Octavia II, Superb II
–  Removing rear seat bench → Body Work; Rep. gr.72.
For the vehicles Yeti
–  Remove rear seat bench with brackets → Body Work; Rep. gr.72.
–  Remove floor covering under the rear seat bench.
For all vehicles
  N20-10710
–  Unclip retaining catches -arrows- of cover for the fuel delivery unit and remove cover.
  Note
For vehicles with auxiliary heating, the plug connection for the dosing pump -V54- must also be disconnected.
  A20-1206
–  Detach the black feed line -A- from the fuel pump. Unlock the quick coupling and disconnect → Chapter.
–  Connect the pressure gauge -VAS 6551- with hose adapter -VAS 6551/1- and -VAS 6551/2- to the open ends of the fuel feed line and connect the fuel pump.
–  Switch on the pressure gauge -VAS 6551- by pressing the button On/Off.
  N20-10510
–  Open the shut-off cocks „A“ and „B“ of the pressure gauge and close the shut-off cock „C“.
–  Start engine and run in idle.
–  Close the shut-off cock „B“ for maximum 15 seconds and during this period, read off the pressure at the pressure gauge -VAS 6551-.
l  Specified value: at least 0.05 MPa (0.5 bar).
If the nominal values are again not reached:
–  Check the fuel flow rate of the fuel pump → Chapter.
  Note
After the assembly, check if all the quick couplings are correctly locked in place by pulling on them!
  N20-10710

Check the fuel flow rate of the fuel pump > < Checking function and voltage supply of fuel pump