If its on a seam its had it .This is a mercedes. Make sure its not a leak from above .Seams are the middle of the tank .Run the tank down to less 1/2 tank see if it stops if so then it vary well could be the seam . But if it dosn't stop under a 1/2 tank then it just looks like the seam and its comeing from above the seam higher on the tank .
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