Volkswagen Passat 1995 Official Factory Repair Manual page 436

Evaporative Emissions (EVAP) system
http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW...
- Operate hand vacuum pump US 8026 several
times.
Vacuum must not build-up
Note:
If the fuel level in the tank is low, hand vacuum
pump may need to be operated at least 20-30
times.
If vacuum builds-up:
- Replace fuel tank cap.
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