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Checking the fuel flow rate of the fuel pump > < Inspecting the fuel pump operating pressure

Fabia Mk2

Checking the pressure in the fuel return-flow line
Checking the pressure in the fuel return-flow line
Special tools and workshop equipment required
t  Pressure gauge, e.g. -VAS 6551-
t  Hose adapter, e.g. -VAS 6551/1-
t  Hose adapter, e.g. -VAS 6551/2-
t  Vehicle diagnosis, measurement and information system -VAS 505x-
Test conditions
l  Battery voltage at least 12 V.
l  Fuses o.k. → Current flow diagrams, Electrical fault finding and Fitting locations.
l  Fuel tank at least 3/4 full.
l  Horizontal position of the vehicle.
l  Flow path in the fuel hoses and the lines in the engine compartment and at the underbody not interrupted due to damage (kinks).
l  All electrical consumers such as the lights and rear window heater must be switched off.
Test sequence
  Note
t  Observe safety measures when working on the fuel system → Chapter.
t  Observe rules for cleanliness → Chapter.
–  Remove engine cover → Chapter.
–  Collect the fuel which flows out with a cloth.
   
–  Detach the quick coupling of the fuel return-flow line -6-. To do so press the release buttons.
  S10-0440
–  Incorporate the pressure gauge -VAS 6551- with the hose adapters -VAS 6551/1- and -VAS 6551/2- in the fuel return-flow line.
  N20-10780
–  Open the shut-off cocks -A and B- of the pressure gauge -VAS 6551-, close the shut-off cock -C-.
–  Switch on the pressure gauge -VAS 6551- by pressing the button On/Off and gauge.
–  Connect vehicle diagnosis, measurement and information system -VAS 505x- and carry out the function „test fuel pump“.
  Note
Now the fuel pump is actuated for only 30 seconds.
–  Read the pressure on the pressure gauge:
l  Specified value: max. 0.03 MPa (0.3 bar)
–  Start engine and run in idle.
–  Read the pressure on the pressure gauge:
l  Specified value: max. 0.03 MPa (0.3 bar)
–  Position the pressure gauge -VAS 6551- on the windscreen in such a way that it is legible from inside.
–  Increase the idling speed to 2500 rpm.
–  Read the pressure on the pressure gauge:
l  Specified value: max. 0.03 MPa (0.3 bar)
  N20-10710

Checking the fuel flow rate of the fuel pump > < Inspecting the fuel pump operating pressure