When you are taking the time to work on a toilet, you will want to start replacing parts to get it back to how it was.
This is a natural reaction as you will assume the issue has to do with the toilet and replacing the parts will correct the problem instantly.
This is not always the case.
You are going to have serious concerns about how the toilet works and this is not ideal over the long-term.
This is when you are going to want to figure out why the toilet is still running after replacing all parts.
The toilet is still running after replacing all parts because it is clogged or one of the parts is incompatible. To fix the issue, use a nylon brush to unclog the toilet, inspect the new components, and tighten the ones that are still loose.
You will often have to think about the plumbing because that is where the problem lies when a toilet is still running.
Do not assume it is the parts that are the issue.
It might be something inside the plumbing that is creating this problem. You will need to use a nylon brush or a drain snake to get to the bottom of things as soon as you can.
Here is more on what some of the main reasons are for a toilet still running after replacing all parts.
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Reasons Toilet Is Still Running After Replacing All Parts
1. Clogged Toilet
This is the number one reason for a toilet still running after replacing all parts.
You are going to have a clogged toilet on your hands.
This is when the toilet is backed up and there is something inside, which is affecting the water pressure in the fixture.
You will want to be quick to act when this is the case.
The goal is to figure out where the clogged area is and what to do about it. This includes taking the time to move forward by acting fast.
You will want to take the time to get started by using a nylon brush and trying to unclog the toilet. Another option is to use a drain snake to dig deeper.

2. Incorrect Part Replacement
It is also possible the parts you have installed are not the right ones.
This is important because some parts are not universal.
You are going to need to look at the layout of your toilet and which components have been installed. If you have installed the wrong components, things are not going to work out as planned and the toilet will keep running.
Go back and take a look at the parts you have set up.
Is there a part that is not supposed to be there? It is this part that will need to be swapped out.
3. Plumbing Issue
You might be dealing with an underlying plumbing issue.
This means there is a pipe that is about to burst or there is something that has damaged it. You will want to go and start taking a look at how the drainage is set up from the toilet.
You will want to see where the problem is.
This includes the water line going to the toilet.
Look into these pipes to see whether or not there is something damaged about them. You will need to replace the pipe if that is the case.

4. Decreased Flush Performance
Is there an issue with the flush?
You might be dealing with a water pressure issue for this part of the property. When this is the case, you will need to take a look at the water line and see what the current pressure is.
A lot of people will also report issues with other water-related fixtures in the house.
This includes shower heads and faucets.
If that is something you can relate to then you are likely dealing with a water-related issue which has reduced the pressure.
You will want to go around the property and test the various faucets to see if this is the case.
Final Thoughts
Look into these tips if the toilet is still running after replacing all parts.
If the toilet is still running after replacing all parts, the fixture is likely clogged or one of the pipes is damaged. To get started, inspect the flush performance, use a nylon brush to unclog the fixture, and make sure to double-check the replacement parts.
You will always want to focus on what you have installed as a replacement.
Sometimes, you might be using the wrong replacement part and that is the reason for these issues still arising.
Don’t assume everything is okay when it might not be.
You will want to be diligent and make sure to work backwards. This includes looking at the water pressure in the toilet.
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