When a toilet is not filling up with water it is a sign of a faulty fill valve, wrong height of the toilet float, a leaking flapper, cracked overflow tube or low water pressure.”
Why does my toilet not refill after flushing?
If a toilet is in perfect condition but does not fill up with water after flushing, you probably have low water pressure. Old rusty pipes and leaking pipes are the most common causes of low water pressure in homes. If this is the problem, your toilet will not be the only plumbing victim.
How do I know if my toilet fill valve is bad?
You can spot a faulty fill valve by listening closely to strange sounds that might be coming from your toilet. The sound of water constantly running through the tank can indicate fill valve problems. Place a few drops of food coloring into the tank and watch to see if the colored water leaks out into the bowl.
