Why Is My Toilet Tank Not Filling: How to Fix It 2022 Guide

Is your toilet tank not filling properly? Normally a toilet tank should refill after every flush. That is how they are designed to function. The water level should be approximately a half inch below the overflow tube and refilling should take around 10 seconds.

When a toilet does not fill with water, it indicates a problem that may be an easy weekend project fix or would necessitate the services of a qualified plumber. There are several possibilities why your toilet tank is not filling, therefore it is best to investigate each one individually.

If your toilet isn’t full of water or is taking too long, I have got some tips here on how to fix it. When a toilet does not fill with water, it is an indication of a defective fill valve, incorrect float height, a leaky flapper, damaged overflow tube, or insufficient water pressure.

In this article, we’ll look at how you can figure out on your own why your toilet tank isn’t full up when you flush it. Keep in mind that it is always best to hire a professional plumber to solve any plumbing problem that is beyond your scope of expertise.

Here are some of the possible causes of why your toilet tank is not filling and what you or your plumber can do about it.

Reasons Why Toilet Tank is Not Filling

Misadjusted Fill Valve

A defective fill valve is the most common cause of a toilet tank not filling. Toilet fill valves are a tube arrangement that notifies the toilet when to fill and when to stop filling.

To begin, check to see whether anything is stuck inside the tube and if the tube itself is intact and free of leaks. Debris or silt can block fill valves over time, preventing the toilet from properly filling and shutting off. This causes excessive water flow and a toilet tank overflow or the toilet to run continuously.

The age and manufacturer of a toilet valve dictate its anatomy. You might be able to change the valve to solve your toilet tank not filling issues.

How to Fix It

Turn the screw on top of your toilet’s fill valve using a flat-head screwdriver. More water can enter if the adjustment screw is turned clockwise. Turning the filling valve screw counterclockwise restricts water flow into the toilet.

Remove the toilet cap cover and locate the fill valve on the left side of the tank if your tank utilizes adjustable cylinders. A clip on the side of the fill valve instead of a screw on top is also possible. Slide the float clip on the side of the float valve up to allow in more water.

The toilet fill valve is the most common cause of a toilet tank not filling or filling slowly. The most typical causes of a fill valve slowing down or failing to fill the tank after a flush are debris issues and the amount of time a fill valve has been in operation.

Debris that accumulates inside the water system over time, such as the valve body, supply line, or shut-off valve, can impede the flow channel of water and lower the valve’s filling speed. The max a fill valve can function is for 7 years.

Misadjusted Float Ball or Arm

Many toilets still use the toilet float ball and arm. If one of these components fails, your toilet may not fill.

The float ball and arm are directly attached to the toilet fill valve and control the flow of water from the toilet bowl into the toilet tank after it has been flushed. If this part is worn out or poorly set, it will either allow too much water to flow into the toilet tank, resulting in overflowing or too little water, resulting in a toilet tank that never fills.

How to Fix It

To let more water into the tank and fill it completely, the toilet ball float and arm must constantly be adjusted. Simply flex the arm slightly upward to elevate the ball to the appropriate height. You may need to tinker with it a little to get it just right so the water fills correctly.

Some float arms additionally include a screw adjustment that may be used if necessary.

If the arm is fractured, it will very certainly require replacement. Fortunately, affordable kits are available at any local hardware shop that you can install yourself.

Damaged Overflow Tube

To prevent overflowing, the overflow tube is a big tube that transfers surplus water from the toilet tank to the toilet bowl. It is located in the center of the toilet tank and functions as a component of the flush valve.

If your overflow tube is fractured or otherwise damaged, toilet water will either continue to fill over the normal level resulting in an overflowing toilet, or toilet bowl water will not drain into the toilet drain hole at all again leading to overflowing.

You can fix this yourself with replacement components. Simply remove the old overflow tube and replace it. Check that the new tube is the same size as the previous one.

Worn-Out Toilet Flapper

The toilet flapper is a rubber seal that closes the flush valve to keep the water in the tank and opens it when the handle lever is pulled. It is the toilet component that drains water from the tank to the bowl when the toilet is flushed. When there is water in the toilet tank, the flapper is designed to remain sealed until the toilet is flushed.

Most homeowners never give the toilet flapper much thought, but this inexpensive and unassuming component is actually one of the most important in your bathroom. It not only prevents toilet leaks but also ensures that you do not have to flush more than once per visit. Still, flappers will fail eventually, and when they do, it is critical to replace them.

Here are some reasons why flappers deteriorate and need replacement.

Both the flap and the floating arm are made of a flexible material, typically rubber or plastic. This material will break or simply wear out over time as a result of repeated use. It’s also worth noting that flappers have been known to develop leaks in as little as five years. While this is not typical, it does occur.

In fact, some manufacturers have stated explicitly that they expect their flappers to last no more than five years. Simply looking at the age of your old flapper will help you determine whether or not it is time to replace it. If the toilet has been installed for more than five years, it may be time to replace it.

Low Water Pressure

Water pressure is one of the most frequent things to check if your tank is not filling properly. If there is insufficient water pressure reaching the toilet tank, it will shut off before entirely filling.

Examine the water level in your bathroom sink. If there is no water in your home, the fault is most likely with the main line. Check if your house or business is receiving municipal water. If water is entering the property but not reaching your bathroom, the low water pressure is most likely caused by a clog or leak in your internal plumbing system.

It might also suggest that your water pump is failing, especially if it affects a large number of tenants in a single building. If you have a tall structure, you may find that your water pressure is lowered at higher elevations.

You may also compare the water pressure rating of your toilet manufacturer to the water pressure in your home. If the toilet demands more water pressure than is currently available, you will need to contact a plumber or your local water provider before proceeding.

Structural Damage to the Toilet

Another possibility is that your toilet is in some manner damaged. Because water seeps out as the tank fills, a damaged toilet with a gradual leak might prevent your toilet from full. If the fracture is on the rear of the bowl, out of sight, it may go unnoticed.

Another sign is puddles of water on the floor; however, the leak or break might be below the floor level, so pools of water aren’t always evident. If there is a crack in the bowl, turn off the water supply to your toilet using the valve under the toilet or the valve that feeds water to your bathroom. Allow no more water into your toilet and stay away from it. It might collapse beneath a user and flood your bathroom, among other things.

If your toilet is damaged or you have any other type of leak, you should fix it as soon as possible since it may cause major structural damage in your house that will be costly to repair later if you don’t notice it in time. You should contact a skilled plumber immediately soon to assess if your old toilet can be fixed or whether a new toilet installation service is required.

Damaged Toilet Trip Lever

The toilet trip lever assembly is an essential part of the filling procedure. The trip assembly of the flush handle is the part that connects to the tank. This assembly might be positioned improperly, causing the flush cycle to fail.

It’s conceivable that this portion will stop signaling to the toilet to fill with water right away. There will still be water in the toilet holding tank, which will continue to stream into your toilet bowl without any indication from you that it is time to flush again.

Toilet Shut Off Valve Not Fully Open

Lastly, the most typical reason for a toilet tank not filling is a problem with your home’s water supply.

Typically, a cut-off valve near the toilet regulates whether or not the toilet receives water from the main water supply line. This valve can become misaligned over time, causing it not to fully open when actuated by the toilet’s handle.

When this happens, toilets cease receiving water, resulting in toilet bowl water not filling up. If this occurs, your toilet tank will not be able to fill above the level of the toilet bowl until you manually open the shut-off valve or the water pressure is restored to full pressure.

How to Fix a Broken Toilet Flapper

tank ball flapper

Your toilet flapper will send you some warning signals just before it fails. They are unable to properly flush your toilet. When flushing, strange noises come from the toilet; your toilet continues to run without stopping and there are leaks.

Replacing a toilet flapper is no big deal. Follow a few simple steps and you can do it easily in no time.

  1. Obviously, you need to turn off the water first so that water doesn’t flood in when you try to tamper with the flapper.
  2. Now you can remove the old flapper without any hassle.
  3. Once the flapper is removed you can prepare and install the new flapper.

How to Install a New Fill Valve

Replacing a fill valve requires opening the hole at the bottom of the tank. If you are not comfortable working on your toilet in this manner, you may need to hire a plumber. Here is a step-by-step guide on how you can do it on your own:

  1. Empty the toilet tank
  2. Two nuts should be visible on the tank’s outside. To begin, remove the screw that links the water supply line to the valve. Remove the supply line from the valve.
  3. Then unscrew the plastic nut that holds the fill valve to the tank, which should be simple to remove. The fill valve should come right out with both bolts unscrewed.
  4. Remove the complete fill valve device, including the float.
  5. Pass the bottom section of the valve through the opening in the tank’s base.
  6.  Reattach the hose to the bottom of the valve and replace any washers that link the tiny water supply line to the bottom of the toilet tank. Screw the big nut back.

Last Option

A broken toilet tank isn’t the end of the world. Your toilet tank may not be full properly due to a problem with its plumbing or the components that power it.

It is rare for a toilet to function despite malfunctioning components. Even if it is tempting to ignore it, toilet components should be changed sooner rather than later if they begin to break. If they are neglected, they may fail. Even if the toilet pieces do not fully fail, faulty fittings consume water and boost your water utility bills.

If your toilet tank isn’t totally full, you’ll need to call a plumber. This implies that there is a problem in your pipes deeper than the toilet, which is why you should call a specialist.

Frequently Asked Questions (FAQs)

How to fix a toilet tank not filling?

As you are now well aware, there can be multiple reasons as to why the toilet tank is not filling. Check out what the issue is, a broken flapper or a faulty valve or anything else, and then fix it accordingly.

What should I do when my toilet tank has no water?

Check out the components of the toilet, the fill valve, ball and arm float, toilet lever; look for any structural damage. If the parts are faulty and can be replaced immediately, proceed to do so. But if there is a major problem that requires the assistance of a plumber, use a hose or fill the tank manually for immediate use.

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