Volkswagen Passat 1995 Official Factory Repair Manual page 2040

EVAP canister system
http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.FU08.20.2
If vacuum builds up:
- Check breather connection -5- at EVAP canister
-4- for soiling, clean if necessary.
- Check Evaporative Emission (EVAP) Canister
Purge Regulator Valve -N80- (-6-) for
throughput, replace if necessary.
If no vacuum builds up:
- Unscrew fuel filler cap from fuel filler tube.
- Connect hand vacuum pump to vacuum tester -
connection B-.
- Set vacuum tester to position -A/B-.
- Operate vacuum pump several times. There must
be no vacuum building up.
If vacuum builds up:
- Check gravity valve
- Check line -3- from fuel tank for throughput.
Page 11 of 22
Page 20-6 , item 28 .
12/6/2004
20-38