Why Is My Toilet Constantly Running Water? Common Causes and Solutions

The toilet is an essential sanitary fixture in the home. If you find that the toilet tank is constantly filling and water is continually flowing out, what could be the reason? Here are some causes of toilet tank leaks:

Why is the toilet tank constantly filling with water

Firstly, check whether the flush lever returns to its original position immediately after being released. If it doesn't, water will continue to flow out. Most flush mechanisms become worn over time and fail to reset properly. In this case, simply pressing the lever again can reset it. Additionally, the water level control device may be damaged or set too loosely or too high, causing the water level to exceed the overflow level and flow into the toilet, resulting in a continuous water flow.

What are the causes of toilet tank leaks

1、Poor-quality products

Some manufacturers blindly reduce production costs, using inferior materials during the injection molding process, which compromises the performance of the supply valve, drainage valve, and water pipes, leading to poor sealing. Water flows through the drainage pipe into the toilet, causing a "long fill" situation.

2、Too small tank fittings

Due to the excessive pursuit of smaller toilet tank fittings, the buoyancy of the float may be insufficient. When the float is submerged, the supply valve may not close, resulting in continuous water flow. The last overflow pipe from the tank drains into the toilet, causing leaks, particularly when the water pressure is high.

3、Poor design

The toilet tank fittings may block each other and cause leaks when in operation. For example, during the draining process, the float and float arm may obstruct the valve's normal reset, leading to leaks. Additionally, if the arm is too long or the float is too large, friction with the interior walls of the tank may occur, affecting the float's movement and leading to sealing failure and leaks.

4、Poor fit between the sealing cover of the drainage valve and the sealing surface of the valve body

There are two types of sealing surfaces for sealing caps and valve bodies: line contact seals and surface contact seals. Most conventional flap-type seals fall under line contact sealing. If the wrong materials are chosen, they may deform or change shape under water pressure, leading to leaks.

In summary：this article provides answers to the issue of a constantly filling toilet tank. I hope this information can help everyone. For more knowledge on this topic, you can visit Hawkrown.