Volkswagen Passat 1995 Official Factory Repair Manual page 435

Evaporative Emissions (EVAP) system
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Vacuum must not build-up
If vacuum builds-up:
- Check breather connection -5- on EVAP canister
-4- for contamination, clean if necessary.
- Remove plug from EVAP canister port.
- Check EVAP canister purge regulator valve
N80- -6- for continuity, and replace if necessary.
(Applies to vehicles up to 07.95 blue valve only.)
If vacuum does not build-up:
- Remove fuel tank filler cap.
- Connect hand vacuum pump US 8026 to
breather hose -3- from fuel tank (previously
removed from EVAP canister -4-)
- Operate hand vacuum pump US 8026 several
times.
Vacuum must not build-up
If vacuum builds-up:
- Check gravity valve
- Check line -3- from fuel tank for blockage.
If vacuum does not build-up:
- Re-install fuel tank filler cap.
Page 6 of 7
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Page 20-5
5/12/2004