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If your toilet tank is not filling after it has been flushed, you’re understandably worried. There are numerous reasons as to why this could happen, some of which are more severe than others.

Leveraging decades of plumbing expertise, we’re here to identify the various reasons your toilet tank is not filling up. In this guide, we will list the most common causes and highlight the importance of hiring a professional plumber to resolve the issue.

Why is My Toilet Tank Not Filling Up?

Shut-off Valve isn't Fully Open

Are you wondering, “Why is there no water in my toilet tank”? The first thing you should check for is a partially open shut-off valve. If the valve isn’t fully open, it will fail to refill the tank with water.

Fill Valve Issues

One of the leading causes of toilets not filling is related to issues with the fill valve, the component that allows water to flow into the tank after it has been flushed. 

• Misadjusted Fill Valve: The fill valve is connected to a float that signals it to open when the tank is empty and to close once the tank is filled. If the fill valve is misaligned, it won't be able to perform this function properly, which can lead to your toilet tank not filling with water after a flush.
• Debris or Clogs: When debris sits and accumulates over time, it can clog the fill valve. Clogs prevent the fill valve from operating, resulting in running water that fails to fill the tank.
• Worn-out Fill Valve: Toilet fill valves can wear out over time, typically around the 7-year mark. If your toilet components are over 7 years old, that could explain why your toilet is not refilling.

Float Issues

Float issues could be another reason your toilet tank is not filling with water. If the float is too low, the water flow into the tank stops, leading to low water levels or a completely empty tank.

Low Water Pressure

Lackluster water pressure in your plumbing system can also be the reason. This issue can result from various factors, which should be professionally inspected and diagnosed.

Worn-out Flapper Valve

If you find your toilet not filling up after flushing, inspect the flapper valve. If there are noticeable signs of deterioration or you hear the sound of continuous running water long after flushing, the flapper valve may need to be replaced.

Damaged Overflow Tube

The overflow tube is a plastic part inside the toilet tank that helps prevent overflow. When this tube gets damaged, whether from natural wear and tear or cracks, your toilet may overflow or fail to fill.

Trip Level Not Working

The trip lever is a key part of the toilet’s operation. It initiates the flushing process and refilling sequence. If the lever is stuck or malfunctioning, it can affect all facets of the toilet’s operation, including the tank's inability to refill. 

Toilet is Cracked or Leaking

A toilet not filling up could be a result of compromised structural integrity. When a toilet has cracks or leakage, filling it up can become much more difficult. Depending on the severity of the crack or leak, it may not fill up at all.

Let Chapman Diagnose Why Your Toilet Tank Isn't Filling

Is your toilet tank not filling? Some culprits are easier to fix than others. If you’re having trouble finding the exact reason, reach out to Chapman Heating, Air Conditioning & Plumbing, Central Indiana’s most-trusted plumbing expert.

Our plumbing experts are available around the clock to handle these types of plumbing issues so you don’t have to.

Contact Chapman today, and we’ll diagnose the exact reason your tank is not filling and develop a repair solution.
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