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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.
1 Do-it-yourself replacement of a leaking toilet shutoff valve typically costs $10-$25 for new parts; requires no special tools or skills; and usually takes 1-2 hours. 2  Broken or failing parts inside the tank (like a fill valve, flapper, ball cock or tank lever) may cause a toilet to run continuously.