Flush the toilet and make sure that the tank doesn't refill (because ... Before removing the old fill valve, you'll want to ...

Place the toilet tank onto the bowl and align the bolt ... If it's minor, like a flush valve replacement, repairing the toilet may be less expensive. On the other hand, if you're facing major ...

If the spring is worn or broken, you need to replace it. Normal water pressure ... Turn it off and flush the toilet. If the tank fills up, then, as with the others, the valve needs to be replaced.