If you are modestly handy take pump apart and clean. Repair kits are available for most major brands. If noise clears and pump works right but fresh tank still fills you can put a shutoff valve between tank and pump - or replace pump. If you have Kantleak four way selector valve there could be a problem there also. Try rotating selector valve a couple turns CC and test. Still filling - try CW and test again. To isolate Kantleak and pump problems - remove pump inlet/suction hose - if water comes out with park water connected - pump check valve is bad.
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