If coming from the trunk it could be two places. First the Fuel Sending Unit's rubber O ring and the second would be the filler tubes seals! Also do you try to pump extra in the tank or just stop when the filler stops?

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~Jamie
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2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's.

1986 190E 2.3 Black, Auto, Mods to come soon.....