Toilet Not Refilling After Flush – The Best Fixing Guide 2023

What to do when a toilet not refilling after flush? You just went to the toilet recently. You were about to wash your hands, and your mom was right! You notice something strange about the old commode.

The toilet lid is lifted again, and you will see it. You can see that the toilet tank not filling as normal.

We get a lot of calls from people complaining about their bathrooms. They tell us that the tank in their toilet is not filling up or it’s slow to refill.

Toilet Not Refilling After Flush – The Best Fixing Guide 2022

Toilet tanks should be filled with water every time you flush. It should take approximately 10 seconds for the water to fill up. If the toilet does not fill up, it could be an indication of a problem that can be fixed quickly or requires professional plumbers.

This could be caused by many different things, so we recommend that you go through each one individually. If your toilet doesn’t fill with water or takes too long to empty, we’ll help you fix it.

Adjustment of the Float Ball

According to our experience, the most common reason for toilet tank problems is the float ball. The toilet float ball is located above the water tank. It is connected with a float arm to regulate water entering the tank. The float ball is connected to a float arm that regulates the water in the tank. It stops water from entering the tank when it reaches an optimal level.

Sometimes the float ball may need to be adjusted over time, just like us all. The easiest way to fix insufficient water in the tank is to bend the arm slightly upward so that the ball rises higher and stops water from entering the tank.

Adjustment of the Float Ball

If this doesn’t work, it may be necessary to replace the floating ball. The hollow interior is what allows a floating ball to float. A float ball can develop cracks or holes as it ages that let water in. A toilet float ball that isn’t hollow and filled with water won’t float well. It is easy to replace a soggy floating ball with a new one. This is a very affordable fix.

If the problem persists, you can try adjusting the float ball or replacing it.

Cracked Toilet Bowl

Sometimes, a crack could occur in the toilet. This can cause water to slowly escape from the bowl leaving it empty or with lower water levels. You can find cracks in the bowl at the base, back, and sides.

It can be difficult to locate cracks, especially if they are small or hidden in inaccessible areas of the bowl.

If there is water around your toilet, the only way to determine if it’s leaky in your bowl.

This indicates that water is leaving the bowl, and dripping onto the floor.


The bowl can bear a lot of weight, so replacing it is the best option. This can be expensive, especially if your toilet is one-piece.

You can seal a small crack that is not above the water line with a waterproof plumber’s glue. Harvey’s Stainless Plumber’s Putty is a good choice.

The sealant is temporary and will not last forever. It is better to replace the bowl. To have it fitted properly at the base, call a plumber. If you also have bowl leaks, this should solve your problem.

Faulty Fill Valve – Poorly Positioned/Damaged

Faulty Fill Valve - Poorly Positioned/Damaged

After flushing the toilet, the toilet fill valve controls how much water flows into the tank. If the tank is not in the correct position, it will supply less water to the bowl.


This issue can be quickly fixed by moving the fill valve to increase the water level in the tank. The type of fill valve used in your toilet tank will determine how to adjust the fill valve. Here are the steps to increase water flow on most fill valves.

Float Cup Fill Valve – Some float-cup fill valves come with a plastic mechanism that allows for you to slide the floating cup up to raise the water level. Others have a spring clip that you can pinch to lift the rod up and raise the water level.

Plunger/Piston or Brass Diaphragm Ballcocks

These plastic diaphragm ballcocks have an adjustment screw at the top which adjusts the height and diameter of the toilet float rod. Use a screwdriver for turning the screw clockwise to raise the water level.

Internal Toilet Float Fill Valve-Twist counterclockwise on the top of the toilet fill valve to unlock it. Then, move the entire head upwards to raise the water level.

To access the valve, empty the tank. To raise the water level, turn the adjustment screw clockwise.

Toilet’s fill valves can also be affected by other issues, such as:

  • Stuck Metal diaphragm Fill Valves

Cast brass fill valves tend to rust. The metal arm can become stuck and the floating ball will remain in the same place. Clean up the rust and adjust your fill valve. Replace the cast brass fill valves with plastic (PVC) ones that are durable and moisture(rust)-resistant

  • Fill valve damaged/worn out

Fill valves, just like other items, will eventually wear down causing leaks and other problems. Replace the old fill valve with a brand-new one.

If The Fill Valve Doesn’t Still Work After Adjustment

If The Fill Valve Doesn't Still Work After Adjustment

If your toilet still doesn’t fill up after flushing, it could be the fill valve. It could be an old fill valve that has reached the end of its useful life.

Check to make sure your fill valve isn’t too old. This can cause the fill valve to stop working properly and block its flow. Drain the toilet tank and turn off the water.

  • One hand holds the fill valve’s shaft at the bottom. The other hand turns the valve cap counterclockwise until the cap comes loose.
  • Take out the fill valve and check the holes in the seat of the valve for any debris.
  • To force debris out, spray water in the holes.
  • Reconnect the water supply and replace the fill valve.

This might solve the immediate problem. However, if your water is contaminated with debris, it could recur. To get rid of excessive minerals, you might consider using a water filter system.

Low Water Pressure

Water pressure is one of the easiest ways to determine if your tank’s filling is not correct. The toilet tank will shut down if there isn’t enough water pressure.

The water level in the bathroom sink should be checked. If there is no water in your home then there may be a problem with your main line. Check that you are receiving municipal water at your business or home. Low water pressure can be caused by a blockage in your plumbing system or a leak in your home’s interior.

This could also indicate that your water pump has failed, particularly if the problem affects multiple tenants within a building. You may notice a decrease in water pressure if you have tall structures.

Also, you can check the water pressure rating of your toilet (usually found on the tank) and compare it to your home’s. You will need to contact a plumber or local water company if the toilet needs more water pressure than what is available.

Cracked Overflow Tube

The overflow tube is a long tube that transports excess water from the toilet tank to the bowl to prevent it from overflowing. It is located in the middle of the toilet tank, and it is a part of the flush valve.

Toilet water that has been damaged or cracked will cause it to continue filling up beyond the normal level.

You can replace the parts yourself to fix this problem. Simply take out the old overflow tube and replace it with the new one. It is important that the new tube has the same dimensions as the original. You can also replace the entire flush valve mechanism.

Worn-Out Flapper Valve

The toilet flapper valve, a rubber valve at the bottom of your toilet tank, is what you need. It prevents the tank water from leaking into the toilet bowl when it’s not being used. It’s important to make sure that the small lift chain holding the valve in place isn’t getting caught under it. This could cause the valve not to seal properly. Sometimes the chain needs to be shortened or updated.

A leaking flapper valve could also be due to being outdated and worn out. Metal flappers have been used in older models and can become deformed or rough over time. This prevents them from sealing against the valve seat.

In recent years, metal flappers were phased out and no longer fit into newer homes. These models are now sealed with silicone rubber. If the flapper valve gasket has become hardened or worn, it must be replaced.

This task can be done by a handyman or a local plumber, depending on your comfort level.

Toilet shut off valve is not fully open

The most common reason a toilet tank doesn’t fill is an issue with the water supply to your home.

A shutoff valve is usually located near the toilet. It controls the water supply to the toilet. The valve may become misaligned over time and not fully open when the handle is pulled on the toilet.

This problem causes toilets to stop receiving water, which can lead to the toilet bowl not filling up. Until you open the valve manually or the water pressure is restored to normal, the toilet tank will not fill above the level of your toilet bowl. The toilet tank will then refill as normal.

Bad Trip Assembly

In the 1960s, it was common for people to complain about bad trips. Bad trips can also happen to your toilet.

The trip assembly is the component of the flush handle that connects to the tank. It could be poorly placed or block the toilet cap lid. These can cause the flush cycle to not complete correctly.

Open the lid of the toilet to inspect the trip assembly and fix any problems. You should inspect the trip assembly if it appears bent, broken, or worn.

Toilet Trap Partial Clog

If there is a clog there will be a siphoning effect inside the trap of your toilet. As it attempts to unclog itself, the waste from the drainpipe continues to drink the water. It is possible for the water to get sipped on enough to reduce the water level in the bowl.

You can flush the toilet to confirm that this is the cause of the low water level in the bowl. After the water has sipped slowly, it will overflow a little to the edge of the toilet. Sometimes, it can drain the bowl completely.

Blockages can range from small biodegradable materials to tampons and foreign items. You should check the trap in the toilet to see if it is stealing water from the bowl. There are several things that you can do if you find the blockage.

  • Determine what kind of clog is inside the trap
  • Fill a 5-gallon bucket with water, and then pour it into a bowl. Also, you can use vinegar, baking soda, or bleach. You can also plunge. This will remove any obstructions from the trapway. You should check for water backing up.
  • For more difficult clogs, use an auger and snake.
  • Rubber gloves are recommended for large amounts of waste, such as diapers stuck in the drain. You can use your hands to find and remove them.
  • These are some more unclogging methods.

Look also – Toilet tank not filling – The Main Reasons And Tips

Toilet Not Refilling After Flush Because A DIY Fails? Call a Plumber

If your toilet tank is not filling correctly, a plumber will be your best choice. This could indicate that you have a serious problem with your pipes or the toilet itself.

Other than a tank not filling, there are other issues that could occur with your toilet. To function properly, toilets depend on the interaction between many parts. Toilets that don’t flush properly could have a problem with their plumbing or the parts that make them work. Sometimes, a toilet can still function even if it has malfunctioning parts.

It’s tempting not to replace any broken parts on a toilet. They could break if they are not replaced. Even if they don’t break completely, malfunctioning parts of toilets can cause water waste and increase water utility bills.

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