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Golf Mk4

Checking fuel tank breather
Checking fuel tank breather
Special tools and workshop equipment required
   
t  Vacuum tester -V.A.G 1368-
  W00-0567
t  Hand vacuum pump -VAS 6213-
Test procedure
  W00-10259
–  Pull breather line -2- from activated charcoal filter -1- off T-piece of throttle valve module -J338--3-.
–  Connect hand vacuum pump -VAS 6213- to line -2-.
–  Pull breather line -5- from fuel tank off activated charcoal filter and connect to -connection A- of vacuum tester -V.A.G 1368-.
–  Connect vacuum tester -V.A.G 1368- -connection B- with breather line -4- to activated charcoal filter.
–  Set vacuum tester -V.A.G 1368- to -B- position.
–  Initiate final control diagnosis and select activated charcoal filter system solenoid valve 1 -N80-: → Motronic injection and ignition system (5-cyl. engine); Rep. Gr.01
–  Operate hand vacuum pump -VAS 6213- several times. Vacuum must not build up.
If vacuum builds up:
–  Check breather connection -6- on activated charcoal filter -1- for soiling, clean if necessary.
If vacuum does not build up:
–  Remove fuel filler cap.
  N20-0171
–  Connect hand vacuum pump -VAS 6213- to vacuum tester -V.A.G 1368- -connection B-.
–  Set vacuum tester -V.A.G 1368- to -A/B- position.
–  Operate hand vacuum pump -VAS 6213- several times. Vacuum must not build up.
If vacuum builds up:
–  Check gravity valve → Item.
–  Check line -1- from fuel tank for blockage.
If vacuum does not build up:
–  Refit fuel filler cap.
–  Operate hand vacuum pump -VAS 6213- several times. Vacuum must not build up.
  Note
If the fuel level in the tank is low, the hand vacuum pump -VAS 6213- must be operated at least 20...30 times.
If vacuum builds up:
–  Renew fuel tank cap.
  N20-0222

Exhaust system > < Assembly overview