Volkswagen Passat 1995 Official Factory Repair Manual page 685

Fuel supply system components, removing and installing
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- Place vacuum pressure tester in position B.
- Activate hand vacuum pump several times.
Pressure should not build up. If pressure builds
up:
- Check vent fitting -5- on EVAP canister -4- for
contamination, clean if necessary
- Check EVAP canister purge regulator valve
N80- -6- for continuity, replace if necessary.
If pressure does not build up:
- Remove fuel filler cap
- Connect hand vacuum pump US 8026 to
vacuum tester VAG 1397A Connector B.
- Place vacuum pressure tester in position -A/B
- Activate hand vacuum pump several times.
Vacuum should not build up.
If vacuum builds up:
- Check gravity valve
- Check wire -3- from fuel tank for continuity
If pressure does not build up:
- Install fuel filler cap
Page 25 of 26
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Page 20-6 , Item 28
5/12/2004