seat Workshop Repair Guides

SEAT Workshop Service and Repair Manuals

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Checking current consumption > < check operation and electricity supply

Leon Mk2

Checking delivery rate
Checking delivery rate
Special tools and workshop equipment required
   
t  Stepladder -VAS 5085-
Test requirements
l  Voltage supply OK.
l  Fuel pressure regulator and retention pressure correct → Chapter
l  Fuel filter correct.
–  Remove filler cap from fuel tank filler neck.
  W00-0713
–  Using the auxiliary cables of the auxiliary measuring set -V.A.G 1594C-, connect the V.A.G 1348 remote control -V.A.G 1348/3A- to contact -5- of the fuel pump and to the (+) positive terminal of the battery.
–  Join contact -5- and contact -1- of the fuel pump using the auxiliary cables of the auxiliary measuring set -V.A.G 1594C-.
  Note
The delivery rate of the fuel pump is measured at a pressure of 4 bar. Therefore, check fuel pressure before measuring delivery rate.
  WARNING
Fuel system is under pressure! Wear safety goggles and appropriate clothing to avoid injury and contact with skin. Before loosening hose connections, wrap a cloth around the connection. Then eliminate the pressure by carefully separating the pipe.
  N20-10204
–  Remove return line -1- of the fuel pressure regulator.
  Note
Press in safety ring to release fuel lines.
–  Connect the adaptor set -V.A.G 1318/17- to the fuel pressure regulator and insert the other end of the adaptor in a measuring container.
–  Operate the remote control V.A.G 1348/3A -V.A.G 1348/3A-for 5 seconds, to fill the fuel filter.
–  Empty measuring container.
–  The quantity of fuel delivered by the fuel pump is dependent upon voltage. Therefore connect multimeter to the battery.
–  Operate remote control for 30 seconds and measure battery voltage.
  N20-0526
–  Compare the fuel flow with specification.
*) Minimum delivery rate cm3/30 s
**) 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, the battery voltage is measured at 12.5 volts. As the voltage at the pump is about 2 V less than the battery, this will equate to a minimum delivery of 600 cm3/30 s.
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 fuel level available upstream of the filter.
  WARNING
Fuel supply pipes are pressurised. Wear safety goggles and appropriate clothing to avoid injury and contact with skin. Before loosening hose connections, wrap a cloth around the connection. Then eliminate the pressure by carefully separating the pipe.
  N20-10138
–  Remove the supply hose -1- of the fuel filter inlet.
  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 adaptor -V.A.G 1318/1- to the adaptor -V.A.G 1318/11- of pressure gauge and place it into a measuring container.
–  Open cut-off tap on pressure gauge. The lever then points in throughflow direction -A-.
–  Activate the V.A.G 1348 remote control -V.A.G 1348/3A-. In doing so, slowly close the cut-off tap until 4 bar is shown on the manometer. From here on, do not change position of shut-off tap.
–  Empty measuring container.
–  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.
If the minimum delivery rate is again not attained:
–  Remove the fuel delivery unit and check the strainer filter for soiling.
Only when up to now no fault has been detected:
–  Renew the fuel delivery unit → Chapter.
–  Reconnect all disconnected fuel pipes.
–  Purge the fuel system → Chapter.
If delivery quantity has been attained, but nevertheless a fuel supply system fault is suspected (e.g. intermittent failure of fuel supply system):
–  checking current consumption of fuel pump → Chapter
  N20-0531

Checking current consumption > < check operation and electricity supply