Model number might help. The 3010/3011DS is an ongoing freshwater tank filling problem. We solved ours by placing an on/off valve with a two foot length of clear hose connected to the garden hose. By inserting this into the fill fitting, this normally allows me to fill the tank without much backflow.
Our freshwater drain is located inside the access door to the water pump in a passenger side compartment toward the rear of the coach.
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Tiffin Allegro Bus 43QRP DP
(Sold)2016 Sunseeker 3010DS
TOADs: Honda CRV and Jeep Grand Cherokee Overland 4 x 4
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