If your toilet tank is failing to fill up with water even though you hear water running continuously, it means water is escaping out of the tank as fast as it enters. This is caused by either a warped rubber flapper valve lying open at the bottom of the tank, or a fill valve refill tube that has detached or fallen below the water line, creating a siphon effect that drains the reservoir. Verification: Inspect the tank interior to ensure the flapper is seated flat and the refill tube is clipped securely above the water line.
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