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Accelerator control > < Checking the tandem pump for tightness (internal)

Octavia Mk2

Checking fuel delivery unit
Checking fuel delivery unit
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 1594 C-
t  Adapter, e.g. -V.A.G 1318/16-
t  Adapter, e.g. -V.A.G 1318/17-
t  Measuring glass
Checking the function and supply voltage
Test conditions
l  Battery voltage at least 11.5 volts
   
l  Fuses o.k. (No. 27)
l  All electrical components such as lights and rear window heater must be switched off.
Test sequence
–  Removing rear seat bench → Body Work → Rep. Gr.72.
–  Remove the cover from the fuel delivery unit.
–  Switch on ignition.
l  The fuel pump must be heard to start running.
–  Switch off ignition.
If the fuel pump does not run:
–  Continuing searching for faults using a multimeter → Current flow diagrams and Fitting locations.
Check fuel flow rate
Test conditions
l  Battery voltage at least 11.5 volts
l  Fuel temperature 15…30 °C
l  Fuel tank at least 1/4 full.
Test sequence
  Note
t  Safety precautions when working on the fuel supply system → Chapter.
t  Observe the regulations concerning cleanliness when working on the fuel supply/injection system → Chapter.
–  Switch off the ignition and pull out the ignition key.
–  Unscrew the cap from the filler neck.
–  Removing rear seat bench → Body Work → Rep. Gr.72.
  S20-0182
–  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
–  Unplug connector -arrow-.
  Note
On vehicles with four-wheel drive, the location of the plug and the fuel lines is different.
  A20-1067
–  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.
–  Connect adapter -V.A.G 1318/17- and adapter -V.A.G 1318/16-, fit onto the feed support and hold 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.
t  The diagram refers to the voltage which exists at the fuel pump.
t  The voltage at the fuel pump is about 2 volts less than the battery voltage.
If the fuel 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 until now:
–  Replace fuel delivery unit.
  S20-0278

Accelerator control > < Checking the tandem pump for tightness (internal)