Certainly, your SeeLevel gauge could be off. But, after 2 years of using the FW tank regularly in our '15, I see water out the vent at various levels of gauge readings. It usually 'burps' water when filling to max. I also get water out the vent when traveling, if over the 85% level. Solved this by using a soft foam plug (ear plug will work) to prevent the sloshing while traveling--allows air to escape, but stops the water. Are you needing to use the tank regularly for dry-camping?
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2016 Tiffin 40QBH
2015 38RSSA--traded
2005 36TK3--retired, but it was a good one
2017 F450 KR
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