I have a 2003 Centurion Cyclone with 3 stock hard tanks. It uses 3 Mayfair Cartridge style pumps. These are the yellow ones with the black tops. When I try to fill the tanks the pumps turn but do not flow any water. If I crack the top of the pump open they spill water out of the top and when the top is snapped back on they pump fine. Emptying the tanks works fine. Any ideas what may be up with these?? Thanks -Bob
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