If the water level in the toilet tank is to high, and the water runs over the overflow causing the toilet to run all the time you may need to adjust the fill valve to the correct height. Also if the replenish tube is below the water line when the tank is filled up it will begin to siphon water from the tank causing the water to continuously run into the bowl. Another problem could be the flush valve seal, or the flapper could be leaking as fast as the water is coming into the tank. A worn, or damaged seal in the fill valve could be making the water run all the time. Lifting up on the float ball, or float gently could help determine the problem. If you are using a universal lever this could also be pressing against the flush valve causing it to hang up which will cause the tank to leak.
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