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1 Broken or failing parts inside the tank (like a fill valve, flapper, ball cock or tank lever) may cause a toilet to run continuously. 2  DIY replacement parts for this problem typically cost $5-$50 depending on the brand of toilet, with an average cost of less than $25. 3  This project might take 20-30 minutes or two hours.
In most instances, both the bowl and the flush valve of the flushometer valve toilets must be replaced to assure water savings and adequate flushing performance. The cost to replace a flushometer type toilet usually ranges from $250 to $400, depending on whether or not the valve will be replaced.