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Safety valve: check and fitting position > < Assembly diagram

Leon Mk1

Fuel tank breather: checking
Fuel tank breather: checking
Special tools and workshop equipment required
   
t  Manual vacuum pump -SAT 1390-
  W00-2716
t  Vacuum tester -V.A.G 1368-
Test conditions
l  Ignition off
Check the activated charcoal filter system
  W00-0567
–  Detach the activated charcoal filter system's breather hose -1- from electromagnetic valve -2-.
–  Connect hand vacuum pump -SAT 1390- to the vacuum hose -1-.
–  Pull breather hose -3- from the activated charcoal filter system -4- and connect it to vacuum tester -V.A.G 1368- -connection A-.
–  Fit vacuum tester -V.A.G 1368- -connection B- to the existing connection in the activated charcoal filter.
–  Set vacuum tester to position -B-.
–  Operate hand vacuum pump -SAT 1390- several times. Vacuum must not build up.
If vacuum builds up:
–  Check breather connection -5- on the activated charcoal filter -4- for dirt, and clean if necessary.
Checking lines to fuel tank and fuel cap
  E20-0131
–  Pull fuel tank breather hose -1- from the activated charcoal filter -2-.
–  Using the illustration as a reference, connect hand vacuum pump -V.A.G 1390- and vacuum tester -V.A.G 1368- to hose -1-.
–  Set vacuum tester to position -A/B-.
–  Unscrew fuel filler cap.
–  Operate hand vacuum pump -SAT 1390- several times. Vacuum must not build up.
If vacuum builds up:
–  Check gravity/overload valve → Item.
–  Check pipe/hose -1- from fuel tank for blockage.
If vacuum does not build up:
–  Refit fuel filler neck.
–  Operate hand vacuum pump several times. Without creating vacuum.
  Note!
If the fuel level in the tank is low, the hand vacuum pump must be operated at least 20…30 times.
If vacuum builds up:
–  Replace fuel tank filler neck.
  E20-0130

Safety valve: check and fitting position > < Assembly diagram