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Skoda Workshop Service and Repair Manuals

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Removing and installing fuel delivery unit > < Removing and installing the fuel tank

Fabia Mk2

Testing fuel pump
Testing fuel pump
Special tools and workshop equipment required
t  Hose adapter, e.g. -V.A.G 1318/16-
t  Adapter set, e.g. -V.A.G 1318/17-
t  Remote control, e.g. -V.A.G 1348/3A-
t  Measuring vessel
  Note
t  Observe the safety instructions before starting fitting work → Chapter.
t  Observe rules for cleanliness → Chapter.
Checking the function and supply voltage
Test conditions
l  Battery voltage at least 11,5 V.
l  Fuses o.k. → Current flow diagrams, Electrical fault finding and Fitting locations.
l  All electrical components such as lights, rear window heater and air conditioner must be switched off.
Test sequence
Vehicles Fabia II
–  Position right rear seat vertically → Body Work; Rep. gr.72.
Vehicles Roomster
–  Fold the rear seats forward and position the middle and rear seat vertically → Body Work; Rep. gr.72.
Continued for all vehicles
–  Remove the cover of the fuel delivery unit under the mat.
–  Switch on ignition. The fuel pump must be heard to start running.
–  Switch off ignition.
If the fuel pump does not run:
–  First of all check the plug for correct fit. Pull on the plug without pressing the locking mechanism. If the plug connection was not correctly positioned, this could cause a fault.
–  Continuing searching for faults using a multimeter e.g. -V.A.G 1715- → Current flow diagrams, Electrical fault finding and Fitting locations.
Check fuel flow rate
Test conditions
l  Supply voltage o.k.
l  Battery voltage at least 11,5 V.
l  Fuel temperature 15...30°C.
l  Fuel tank at least 1/4 full.
Test sequence
–  Unscrew the cap from the filler neck.
Vehicles Fabia II
–  Position right rear seat vertically → Body Work; Rep. gr.72.
Vehicles Roomster
–  Fold the rear seats forward and position the middle and rear seat vertically → Body Work; Rep. gr.72.
Continued for all vehicles
–  Remove the cover of the fuel delivery unit under the mat.
–  Unplug the 4-pin plug from the fuel delivery unit.
   
–  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 +.
–  Use connection lines from the measuring tool set to connect the contacts -4- to the plug and to the fuel pump.
–  Pull off the fuel feed line and gather residual fuel in a cloth.
  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.
–  Connect adapter -V.A.G 1318/17- and -V.A.G 1318/16- to the fuel delivery unit and hold in the measuring vessel.
–  Activate remote control -V.A.G 1348/3A- for 30 seconds.
  S20-0279
–  Compare the amount of the fuel pumped to the specified value (the amount of the fuel pumped is dependent on the voltage at the fuel delivery unit).
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 until now:
–  Replace fuel delivery unit.
  S20-0278

Removing and installing fuel delivery unit > < Removing and installing the fuel tank