There shouldn't be any "shelf" the tank should be smooth, and the bottom should gently slope to the discharge port....
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Be Safe, and Everyone Goes Home,
Rick
2014 RAM Laramie 2500 w/6.7L Cummins Diesel and Automated Safety Hitch
2016 377RLBH Jayco North Point
300W of Suntech Solar w/Rogue MPPT Controller & Xantrex 2000W PSW Inverter
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