Why does the toilet water tank not fill appropriately?-Quick DIY fix

The toilet is the most essential in every house. You always love a well-decorated washroom in the morning. A net and clean bathroom make you happy and ensure the hygiene of your whole family. Water is a must to clean the waste from the toilet bowl to the septic tank. And the pressure of water in a fixed amount makes this happen. If the flush didn’t meet the quantity, then the bowl isn’t espied totally. And most of the time, this occurs because of less water in the tank. This article will explain why this issue occurs and how you can solve this problem.

What is a water tank in a toilet?

A water tank is the central part of every toilet to clean the bowl. The waste creates a power that forces all the debris to the drainage pipe from the toilet bowl. This enforceability helps remove all the dirt from the bowl to the septic tank. Creating this force requires a fixed amount of water—the toilet needs around 1.6 gallons for each flush from the beginning. But now people are very aware of their financial condition. Modern science invented a water-saving flushing system that uses 1.28 gallons of water per flush. This water is enough to clean the bowl. If the meter doesn’t meet the amount, you face this issue.

What is the reason behind the water not filling the toilet tank?

There are many reasons behind this problem. The most common cause and solution behind this issue I try to talk about this here:

Issues Fixes
No water supply
  • Turn on the water supply valve
  • Check the main supply line
Low water level
  • Adjust the float
  • Unclog the fill valve and flapper
  • Turn the fill valve screw clockwise to higher the water level
Low water pressure
  • Unclog the fill valve and supply line
  • Higher the float
  • Installs a booster pump
Leaky toilet
  • Check the float ball
  • Replace the damaged rubber seal
  • Check if there is any crack
Flapper issue
  • Adjust the chain
  • Check if the flapper gets stuck
  • Replace worn-out flapper


  • Water supply stop:

Is it possible to flush a toilet without water? Nope, because the main ingredient of flushing a toilet is water. So, if your toilet tank is not filled, first, you have to check the toilet tank.

First, check the main water tank, which mainly supplies the water in the flushing system. If the main water supply is cut off, your toilet tank is not filled. This time, you face this problem.

Solution: Check the main water supply. Try to turn on the system. If there is no water there, then the problem is further upstream. Check the main water supply of the building, and make sure you get the municipal water. The problem is not here when the water starts entering the home, but there is still no water in the tank. It would help if you went another way.

  • Low water level:

This is another reason behind the water disturbance. Somettank, the water level is not set corre after installing a new tank. You can notice the mark on the tank. Water needs to cross the levels for every successful flush system.

Solution: To solve this issue, you can ask for help from the plumber. But many people do it manually.

  • Low water pressure:

Water pressure is one of the most important things to f up the tank. So when the power is prolonged, this is like having no water in the tank. So this is a water supply issue at all. That means it’s a water supply issue. And if you live in a tall building with many tenants, you often face this problem.

Solution: there is only one solution to this problem. That installs a booster pump to fix this issue.

  • Damaged lever:

A lever is an internal part of the toilet. And this is connected to the handles. Sometimes the trip of the lever assembly fails if itcorruptedoded and disconnected. You can easily find out if you o up the toilet and examine the inner part. replace toilet handle

Solution: this problem is easy to solve, and you can solve this by yourself with the help of the internet. This problem can easily be fixed with homeware or sanitary supply store trips. If you are new to this situation, call a plumber to eliminate this issue.

  • Float ball issue:

The float ball is used to control the quantity of water. The toilet often faces the problem with this float bulb and the size of its arm system that guides the fill valve. If there is any component installed incorrectly, the water tank stops filling. The ball becomes worn after many years, leaks, and creates problems in floating correctly. Just like that arm also defected as time passed.

Solution: If the problem is related to arms size, you must adjust it. It would be best if you did not keep a too-old float ball inside your toilet tank. I suggest replacing the old one and installing a new one. That can quickly solve this issue.

  • Flapper issue:

The toilet flapper is a rubber valve that attaches to the bottom of the toilet tank. It seals the water in the tank before flushing. If stuck under the valve, this is held with a small chain, so it fails to fill the water in the tank. And if you use this for many years, it is just worn and damaged.american standard toilet flapper replacement

Solution: if the chain issues, open up the water tank and then adjust the length of the chain. And if the valve somehow got worn and damaged, you need to replace it as soon as possible. If it fails to seal the water in the tank, you will waste a lot of water. You can fix it, or if you want, you can have a plumber fix this for you. But after fixing the issue, ensure no water leakage or runny water from the tank.

  • Damaged toilet bowl:

A broken toilet bowl is also a water-filling issue. The crack of the bowl was proven to fill up the tank. Sometimes tamarack is small and in the back of the toilet, so it is tough not to notice and fix it.

Solution: there is no other solution. You can only change the bowl as soon as possible. And when you find the problem, stop using the washroom; otherwise, you’ll end up flooded.

Frequently Asked Questions (FAQs)

Why my toilet tank is not filling anyway?

You must check all parts of your toilet, including the flushing lever, float ball, valve, etc. Most of the issues about toilet filling occur from the incoherence between the toilet tank and the floating valve. So, you must set up the floating valve properly.

How can I adjust a toilet fill valve inside the toilet tank?

A toilet fill valve is essential to stay inside the toilet tank. It looks like a tower, and it is very easy to install. If the water level of your toilet tank is problematic, you should turn the screw on the toilet fill valve counterclockwise. Finally, you should wait until the toilet tank is filled up, and then flush the toilet to check it.


This reason is the most people face for not filling the water tank. But If this does not match yours, I suggest consulting with a professional. The problem relates to the pipeline or other inner elements. And if you have used the toilet for years, it’s a prevalent issue. Try to find the reason behind the problem and solve it as soon as possible. Because it’s impossible to live one day without using a washroom, and no bathroom is as comfortable as your home.

Hi, this is Robert Crossan, the owner of this website, has 17 years of experience in the installation, maintenance, and repair of toilets and plumbing systems. After completing the Level 2 Basic Plumbing course in 2005, I started working in both domestic and commercial buildings as a professional plumber. So I can figure out the core difference between different toilet models and brands. It also helped me monitor their work performance and setbacks.

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