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Check voltage consumption of the fuel pump > < Test feed pressure of fuel pump

Octavia Mk2

Check the fuel flow rate of the fuel pump
Check the fuel flow rate of the fuel pump
Check with the vehicle diagnosis, measurement and information system -VAS 505x-
  Note
For checking the fuel flow rate of the fuel pump, the procedure with the remote control -V.A.G 1348/3A- can also be used → Anchor.
Special tools and workshop equipment required
t  Measuring vessel
Test conditions
l  Battery voltage at least 12.5 V.
l  Fuel filter o.k.
l  Fuel tank at least 1/2 full.
l  Ignition off.
Test sequence
  Note
t  Safety precautions when working on the fuel supply system → Chapter.
t  Observe rules for cleanliness → Chapter.
–  Remove engine cover → Chapter.
  WARNING
The fuel feed line is pressurized! Place a clean cleaning cloth around the connection point before detaching hose connections. Reduce pressure by carefully releasing the connection point.
   
–  Detach the fuel feed line -arrow- from the high pressure pump.
  A23-10436
–  Hold the fuel feed line -1- (lengthened with a suitable hose -2-) in a measuring vessel -3-.
–  Connect vehicle diagnosis, measurement and information system -VAS 505x- and carry out the function „test fuel pump“.
  Note
The fuel pump is actuated for 30 seconds.
l  Specified value of minimum flow rate in 30 seconds: min. 600 ml
If the minimum flow rate is not reached, the following faults may be present:
t  Battery voltage too low.
t  Fuel lines crimped, carry out a visual inspection.
t  The fuel filter is clogged.
t  There is a leak in the fuel system, check for tightness.
t  Fuel pump defective: check → Chapter.
Check with the remote control -V.A.G 1348/3A-
Special tools and workshop equipment required
t  Remote control, e.g. -V.A.G 1348/3A-
t  Measuring tool set, e.g. -V.A.G 1594C-
t  Adapter, e.g. -V.A.G 1318/16-
t  Adapter, e.g. -V.A.G 1318/17-
t  Measuring vessel
Test conditions
l  Battery voltage at least 12 V.
l  Fuel temperature 15…30 °C.
l  Fuel tank must be at least 1/4 full.
Test sequence
  Note
t  Safety precautions when working on the fuel supply system → Chapter.
t  Observe rules for cleanliness → Chapter.
–  Unscrew the cap from the fuel filler neck.
Vehicles Octavia II and Superb II
–  Removing rear seat bench → Body Work; Rep. gr.72.
Vehicles Yeti
–  Remove rear seat bench with brackets → Body Work; Rep. gr.72.
–  Remove floor covering under the rear seat bench.
Continued for all vehicles
  A23-10437
–  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 be disconnected additionally.
–  Unplug the 5-pin plug from the fuel delivery unit.
  A20-1206
–  Connect remote control -V.A.G 1348/3A- with connection lines from measuring tool set to contact -1- of the fuel pump and to battery positive terminal.
–  Use connection lines from the measuring tool set to connect the contacts -5- to the plug and to the fuel pump.
–  Pull off the fuel feed line from the flange of the fuel delivery unit. Unlock the quick coupling and disconnect → Chapter.
–  Connect adapter -V.A.G 1318/17- and adapter -V.A.G 1318/16-, fit onto the feed support and hold the other end in a measuring glass.
–  Activate the remote control -V.A.G 1348/3A- for 30 seconds.
–  Measure the battery voltage.
  S20-0303
–  Compare the fuel rate with the specified value.
  Note
t  The amount of the fuel pumped is dependent on the voltage at the fuel pump.
t  The diagram refers to the existing voltage at the fuel pump which is about 2 V less than the battery voltage.
If the minimum flow rate is not reached:
–  Remove the fuel delivery unit and check whether the pump strainer is not clogged up.
If no fault was detected:
–  Replace fuel delivery unit:
t  on vehicles Octavia ll with front-wheel drive → Chapter
t  on vehicles Superb II, Yeti and vehicles with four-wheel drive Octavia II → Chapter
  S20-0278

Check voltage consumption of the fuel pump > < Test feed pressure of fuel pump