Look under the unit,may have to drop the coroplast black lining first,to see if the pump draws from the side. If it does then you will start sucking air when there is 2" left in the tank. If you can get the hose off the fitting on the tank,simply take fitting off and glue in about 2 feet of plastic hose to the inside of the fitting ,add a brass bolt to the end of the hose for weight and punch in some holes to the end of the hose and reinsert fitting. Hook hose back up and now you will be sucking from the bottom of the tank....you will get all the water now.
It was a rainy few days at Algonquin Prov park...tarps kept us dry.
Wayne --Belle River (Windsor), Ontario
2013 Sunset Trail Reserve 25RB..
2015 White Chev Silverado 2500HD 4x4 (6.0 l gasser)
2003 Mountain Star 890SBRX Truck Camper