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Testing the vacuum at the fuel return-flow line from the injection units > < Removing and installing the high pressure pump

Fabia Mk2

Testing the vacuum on the high pressure pump
Testing the vacuum on the high pressure pump
Observe safety measures and rules of cleanliness when undertaking all work on the fuel system → Chapter.
Special tools and workshop equipment required
t  Pressure measuring device -VAS 6551-
t  Adapter -VAS 6551/3-
t  Adapter -VAS 6551/4-
  Note
In order to prevent an unnecessary replacement of the high pressure pump, relevant tests of the low pressure area of the fuel system must absolutely be carried out in order to correctly test the vacuum on the high pressure pump ⇒ „Test fuel pump“ → Chapter.
l  Battery voltage at least 12.5 V.
l  Fuel filter o.k.
l  Ignition is switched off.
Test sequence
–  Remove engine cover → Chapter.
   
–  Unlock the fuel return-flow line and carefully detach it from the high pressure pump.
–  Connect the hose adapter -VAS 6551/3- to the free end of the fuel return-flow line, insert it into a measuring glass with a volume of approx. 3 litres and hold it inside.
  N22-10000
–  Connect the pressure gauge -VAS 6551- with hose adapter -VAS 6551/4-, fitted on the connection -C-, to the free connection -arrow- on the high pressure pump.
  N23-10448
–  Open the shut-off cock -C- of the pressure gauge -VAS 6551-, close the shut-off cocks -A and B-.
–  Switch on the pressure gauge -VAS 6551- by pressing the button On/Off and gauge.
–  Switch on the ignition and start the engine.
–  Read the pressure on the pressure gauge -VAS 6551-.
Specified value: min. - 0,30 bar
If the specified value is reached:
–  Test the vacuum at the fuel return-flow line on the injection units → Chapter.
If the specified value is not reached:
–  First of all, test the fuel pressure in the fuel return-flow line in the low pressure area and if necessary, repair this return-flow line → Chapter.
If the specified value is also not reached although the fuel pressure in the fuel return-flow line in the low pressure area is correct:
–  Replace high pressure pump → Chapter.
  N23-10437

Testing the vacuum at the fuel return-flow line from the injection units > < Removing and installing the high pressure pump