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| Connect the hand vacuum pump to the vacuum tester -connection B-. |
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| Move vacuum tester into position - A/B -. |
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| Operate -V.A.G 1390- several times. No vacuum should build up. |
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| Check line -1- from the fuel tank for blockages. |
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| Unscrew the cap from the fuel filler neck. |
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| Operate the hand vacuum pump several times. No vacuum should build up. |

Note | The hand vacuum pump will have to be actuated at least 20...30 times when there is little fuel in the fuel tank. |
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| Replace the cap on the fuel filler neck. |
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