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| Pull vent hose -1- from fuel tank off activated charcoal filter -2-. |
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| Then connect hand vacuum pump -V.A.G 1390- and vacuum tester -V.A.G 1368- as shown to hose -1-. |
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| Set vacuum tester to -A/B- position. |
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| Remove fuel filler cap. |
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| Operate hand-operated vacuum pump -V.A.G 1390- several times. Vacuum must not build up. |
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| Check gravity/overflow valve → Item. |
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| Check line -1- from fuel tank for free-flow. |
| If vacuum does not build up: |
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| Operate hand-operated vacuum pump -V.A.G 1390- several times. Vacuum must not build up. |
Note | If fuel level in tank is low the hand vacuum must be operated at least 20...30 times. |
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