Home & Real Estate

5 Reasons Your Toilet Tank Won’t Fill and How to Fix It

Have you noticed that your toilet tank won’t fill with water anymore?

While it’s frustrating to have these plumbing problems, it’s not the end of the world. As long as you figure out what’s causing the toilet problems, you should be able to find plumbing solutions without much trouble.

All you need is a bit of advice to get yourself started. Keep reading to see our list of the most common causes of a half-filled toilet tank and how to fix them.


1. Blockage in the Water Supply Line

This is generally the result of something blocking the line, like a foreign object or mineral deposits. Start inspecting the supply valve and potentially the water line itself.

If any blockages are present, they should be removed from the line. If the blockage is severe, the water line will need to be replaced. If you are unable to fix it yourself, you can always call a plumbing and heating service for assistance.

2. Faulty Fill Valves

These valves are prone to wear and tear with age and continuous usage. When a fill valve fails, it may not be able to regulate the water entering the tank, preventing the tank from filling up.

You will need to replace the entire valve assembly. This is a fairly easy DIY job that you can manage yourself. It is important to make sure that the new fill valve is the correct size and shape to fit the tank before screwing it back in.

3. Deficit in the Water Pressure

Use a pressure gauge to measure the water pressure. If the pressure is lower than the required level, the water pressure must be increased. This can be done by replacing the washers on the copper pipes, cleaning the sediment from the pipes, or replacing the broken pipes.

If these solutions do not work, you may need to call a professional plumber to check the water main for an obstruction or to repair the broken pipe.

4. Clog in the Pipe

To diagnose this, start by plunging the toilet. If that doesn’t work, next, check the water level in the back of the toilet. If the water level is low, this could be an indication that there’s a clog in the pipe.

The best way to unclog the pipe is to remove the pipe from the toilet and clear the clog manually using a plunger. If you don’t feel confident enough to do this, you can also call a local plumber to come and unclog the pipe for you.

5. Leaking Flapper Problem

When this valve does not create a proper seal, water that is supposed to fill the tank escapes into the toilet bowl, leaving the tank empty. If the flapper shows signs of cracking or age, it should be replaced. A new flapper is easily installed and can be found at any home improvement store.

The flapper should be adjusted to ensure it fits securely in its place. The chain length should be adjusted, making sure the flapper is pushed down into its place.

Use This Guide to Know Why the Toilet Tank Won’t Fill and Fix It

The most likely cause why a toilet tank won’t fill is a lack of sufficient water pressure from the water supply. This can often be fixed with a few simple steps. Check the shut-off valve is open, check for clogs in the water line, and seek professional help if the problem persists.

Take action now to ensure your toilet stays in optimal condition.

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