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Venting air from the fuel system > < Inspecting the non-return valve of the fuel delivery unit and holding pressure

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Checking fuel operating pressure
Checking fuel operating pressure
Special tools and workshop equipment required
t  Remote control, e.g. -V.A.G 1348/3A- with adapter cable -V.A.G 1348/3-2-
t  Pressure gauge appliance, e.g. -V.A.G 1318-
t  Adapter, e.g. -V.A.G 1318/1-
t  Adapter, e.g. -V.A.G 1318/11-
t  Adapter, e.g. -V.A.G 1318/17-
   
–  Pull out the fuel feed line -2- and catch the fuel which flows out with a cleaning cloth.
  S10-0389
–  Connect the pressure gauge -V.A.G 1318- with adapter -V.A.G 1318/11- and -V.A.G 1318/17- to the fuel feed line, the shut-off cock on the measuring device must be in position -A-.
–  Start engine.
Specified value 3.92...4.20 bar (0.392...0.420 MPa).
If the measured value is higher than 4.20 bar (0.420 MPa):
–  Check fuel return-flow line between the fuel filter and the fuel pump for continuity or replace fuel pressure regulator.
If the measured value is lower than 3.92 bar (0.392 MPa):
–  Check lines and fuel strip for leaktightness.
  S20-0106
–  Connect the pressure gauge -V.A.G 1318- with adapter -V.A.G 1318/11- and -V.A.G 1318/17- to the black feed line from the pump to the fuel filter (old version filter shown with integrated fuel pressure regulator). For the new version of the filter with disassembled fuel pressure regulator the black feed line is connected to the fuel filter outer connection.
–  Open shut-off cock on the measuring device -position A-.
–  Start engine.
Specified value 3.92...4.20 bar (0.392...0.420 MPa).
If the specified value is not reached:
–  Close shut-off cock -position B-.
Actuate the fuel delivery unit with the remote control -V.A.G 1348/3A-.
–  Connect remote control -V.A.G 1348/3A-.
–  Activate remote control until a pressure of at least 3.7 bar (0.37 MPa) is built up.
The fuel delivery unit can also be actuated using the actuator diagnosis → Vehicle diagnostic tester.
  WARNING
Maximum pressure of the fuel delivery unit is 7 bar (0.7 MPa). If this pressure is reached - risk of damage to the fuel delivery unit.
If the specified value of at least 3.7 bar (0.37 MPa) is reached:
–  Replace the fuel pressure regulator.
If the specified value of at least 3.7 bar (0.37 MPa) is not reached:
–  Replace fuel delivery unit → Chapter.
  S20-0105

Venting air from the fuel system > < Inspecting the non-return valve of the fuel delivery unit and holding pressure