I'm having a very strange problem. The toilet continuously runs, but it won't do the 'pour water till the tank fills up.' There's nothing wrong with the flapper, because when I can get it to run properly, it doesn't leak. I don't know how to get the toilet's tank to fill up. I have no idea what's going on, and I need to get this thing fixed before next week. Thankfully there are other toilets int he house but this is still something I need to fix. The toilet is a Kohler, I don't know the model.