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Fuel supply parts: Removing and installing > < Activated charcoal filter system:

Leon Mk1

Testing quantity of fuel delivered
Testing quantity of fuel delivered
Test prerequisites
l  Speedometer must be okay.
l  Remote control for V.A.G 1348 -V.A.G 1348/3A- is connected.
Checking sequence
  Note
The delivery rate of the fuel pump is measured at a pressure of 3 bar. This is why you have to check the fuel pressure before measuring the delivery rate.
–  Remove filler cap from fuel tank filler neck.
   
–  Disconnect the fuel return line -1-. Push the buttons on the fuel hose coupling for this purpose.
–  Connect the Adapter -V.A.G 1318/17A- to the fuel pressure regulator and place the adaptor end in a measuring container.
–  Operate remote control -V.A.G 1348/3A- for approx. 5 seconds to fill fuel filter.
–  Drain measuring glass.
–  The quantity of fuel delivered by the fuel pump is dependent upon voltage. Therefore, connect the multimeter with auxiliary line from the auxiliary measuring set -VAG 1594C- to both external contacts (with connector attached) of the fuel pump.
–  Operate remote control for 30 seconds and measure the voltage.
  N20-0526
–  Compare quantity of fuel delivered with specification.
1)  Minimum delivery cm3/30 s
2)  Voltage on the fuel pump when the engine is stationary and with running pump (approx. 2 volt under battery voltage).
Readout example:
During the test a voltage of 10.5 volts is measured. At this voltage the pump can produce a minimum delivery rate of 540 cm3/30 Secs.
If the minimum delivery rate is not attained:
–  Check the fuel supply pipes to the filter for possible restrictions (kinks) or blockages.
If the fuel line is not damaged:
–  Check the flow of fuel at the entry to the fuel filter.
  WARNING
Fuel supply pipes are pressurised. Wear eye protection and gloves to avoid injuries and skin contact. Before loosening hose connections, wrap a cloth around the connection. Then eliminate the pressure by carefully separating the pipe.
  N20-0134
–  Pull supply hose -1- off inlet to fuel filter.
  Note
Press in safety ring to release fuel lines.
–  Connect pressure tester -V.A.G 1318- using the adaptors -V.A.G 1318/17-as shown.
–  Connect the Adapter -V.A.G 1318/1- to the Adapter -V.A.G 1318/11- of the pressure gauge and hold it in the measurement container.
–  Open cut-off tap on pressure gauge. The lever then points in through flow direction -A-.
–  Activate the V.A.G 1348 remote control -V.A.G 1348/3A-. In doing so, slowly close the shut-off cock arrow until pressure gauge indicates a pressure of 3 bar. From here on, do not change position of shut-off tap.
–  Drain measuring glass.
–  Activate remote control again for 30 seconds. Compare the flow with the first value measured.
If the minimum delivery rate is now attained:
–  Replace the fuel filter → Chapter.
If the minimum delivery rate is again not attained:
–  Remove the fuel delivery unit and check the strainer filter for soiling → Chapter.
Only when up to now no fault has been detected:
–  Renew fuel delivery unit → Chapter
  N20-0531

Fuel supply parts: Removing and installing > < Activated charcoal filter system: