Please help for some reasons I'm doing something wrong, the toilet is overflowing into the tube as the water is not shutting off. I have replaced the washer in the injet valve but it's still not shutting down, when I manually raise the ball the water still doesn't shut down, water still splashes out from the lever unit unto the walls of the toilet bowl does this mean the washer isn't working? I have tried lowering the float ball but still no difference please someone help much appreciated