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"You might try taking off the plastic trim piece where the vent pipe goes through the basement floor (the tank top is right underneath this) to see that it is properly sealed." Note on this.. The OEM seal in my 06 3400 was the improper seal or as the service guy who replaced my tank said... Of very low quality. I was actually also leaking there also but we never noticed that as we never let it fill to the top.
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