I don't know what you mean by "pumping" the tank. If the toilet runs, then either the fill valve is defective or the seal on the flush valve is defective. First, check to see that when you move the float, the toilet stops running. If it does not, then replace the fill valve. If it does, then inspect/replace the seal on the flush mechanism at the bottom of the tank. If this seal is bad, you can usually see water continuously flowing (slowly) into the bowl. You will see ripples on the surface of the water in the bowl.
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