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WE just had this problem on a customers P337H. The Three round caps on top of each inboard fuel tank were leaking out the gaskets. Wings have to be supported, fuel drained to about 15 to 20 gal, remove inboard tank access covers, change gaskets, and put it all back together. These tanks have fuel all the way to the top for quite a while, probably till 30 gals are burned out which is why when filled and flown you may not see leaks but sitting full overnight will show up. Also, the outboard tanks may need to be checked to if this doesn't totally resolve the problem.
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