If it s normal replace the toilet fill valve.
Toilet pressure tank not filling.
Steps for removing the top cap and flushing out debris from the fill valve.
If water pressure is the reasoning for your toilet tank not filling with water then you might want to start by inspecting your home s water pipes.
Turn off the water supply valve and unscrew the inlet hose on the bottom of your toilet s tank.
First shut off the water to your toilet and flush it to empty the tank.
The flow of water from the supply line to refill the toilet tank is controlled by the fill valve.
With your right hand hold onto the gray shaft keeping the float cup all the way up.
It will likely be on the left side.
You may also need to clean out the siphon holes in the bowl rim.
A slow filling toilet tank is a relatively common problem.
Make sure the water shutoff is completely open for maximum water flow.
If the fill valve isn t properly placed the water supply can be impeded.
When a toilet tank is not filling check the house water pressure.
Locate the fill valve in the toilet tank.
Reach inside the tank with your right hand under the float cup and lift it up.
Sometimes there s buildup in the valve so cleaning should help open.
Using a flathead screwdriver.
The fill valve needs an adjustment.
Do not allow the float cup to drop or valve shaft to turn.
To increase water pressure in your toilet try adjusting its fill valve.
If the toilet has no flush power you may need to adjust the water level in the tank or the length of the flapper chain.
Check the hose s filter screen for debris then remove the screen and rinse it thoroughly to.
You can adjust it by pinching the clips or twisting the nob on top then raising it to your desired height.
If that doesn t help you might need to clean the pump and valve.
The fill valve is usually on the side of the tank.