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Electronic power control (EPC) > < Activated charcoal filter system

Leon Mk1

Checking delivery rate
Checking delivery rate
Check conditions
l  Voltage supply OK.
l  Remote control -V.A.G 1348/3A- connected.
Test sequence
–  Remove filler cap from fuel tank filler neck.
   
–  Uncouple supply hose -1- and collect leaking fuel with a cloth.
  Note!
Press buttons on hose couplings to do this.
  Caution
Fuel supply pipes are under pressure. Before removing hose connections wrap a cloth around the connection. Then release pressure by carefully pulling hose off connection.
  E10-0018
–  Connect pressure gauge -V.A.G 1318- with adapter -V.A.G 1318/23- and -V.A.G 1318/17- to the fuel supply pipe.
–  Push the hose -V.A.G 1318/1- onto the adapter -V.A.G 1318/11- on the pressure gauge and hold hose in a measuring container.
–  Open shut-off tap on pressure gauge. The lever will indicate flow direction -A-.
–  Operate remote control -V.A.G 1348/3A- and slowly close cut-off tap, until pressure gauge shows 3 bar From this point on do not move position of cut-off tap.
–  Empty measuring container.
–  The quantity of fuel delivered by the fuel pump is dependent upon battery voltage. Therefore connect the multimeter with adapter cables from -V.A.G 1594- to the vehicle battery.
–  Operate remote control for 30 seconds and measure battery voltage
  E20-0030
–  Compare the quantity of fuel delivered with specification.
*) delivery cm3/30 s
**) in fuel pump with engine off and the pump working (approx. 2 volts less than battery voltage).
Example:
During the test, a voltage of 12.5 volts is measured at the battery. As the voltage at the pump is approx. 2 volts less than the battery voltage, this will equate to a minimum delivery of 540 cm3/30 s.
If the minimum delivery rate is not attained:
–  Check the fuel pipes for possible restrictions (kinks) or blockages.
  N20-0134
–  Pull supply hose -1- off inlet to fuel filter.
–  Connect the pressure gauge -V.A.G 1318- with adapter -V.A.G 1318/10- to hose.
–  Repeat delivery rate check.
If the minimum delivery rate is now attained:
–  Replace the fuel filter.
If the minimum delivery rate is again not attained:
–  Remove fuel delivery unit → Chapter, and check filter for dirt.
Only when up to now no fault has been detected:
–  Fuel pump defective, renew fuel delivery unit → Chapter, fuel delivery unit: removal and installation.
If the delivery rate has been attained but nevertheless you suspect a fuel supply system fault (e.g. intermittent failure of fuel supply system):
–  Check the current draw of the fuel pump as follows:
–  Reconnect all disconnected fuel pipes.
  E20-0074
–  By means of a current clamp, connect multimeter -V.A.G 1715- to one of the fuel pump supply cables (external contacts of the flange connector).
–  Start the engine and run at idling speed.
–  Measure the current draw of the fuel pump.
   Specifications: max. 8 amps.
  Note!
If the fuel system malfunction is intermittent, you can perform the check during a test drive with the help of a 2nd person.
Observe safety precuations when test driving → Chapter.
If the current draw is exceeded:
–  Fuel pump defective, renew fuel delivery unit → Chapter, Fuel delivery unit: removal and installation.
  E20-0075

Electronic power control (EPC) > < Activated charcoal filter system