My Toilet tank is leaking, as evident by the water tank level going down, and the tank then refilling constantly. I have ruled out leaks from the bolts and from the water inlet valve and hose. I have noticed that the water only goes as low as the rubber flush valve in the tank. So my guess is that is where the leak is.. But if this is correct, how come no more water continues to go into the bowl of the toilet? (in other words, would the bowl keep filling up till it overflows?) My understanding is that the tank water goes into the bowl via the flush valve... Thus, if this is where the leak is, wouldn't the bowl overflow? Or, if not, where and how is the water going? I want to make sure I am repairing the right thing before I replace anything! Thanks!!!