Volvo V40 I (1997, 1.8 Gasoline): Fuel Sensor Issue - Incorrect Fuel Level Readings & DIY Fixes

Hello, the fuel sensor has not worked for a month, I did not replace it because I see sensors together with fuel pumps and I need the sensor itself, so I decided to ask for help on this forum, I would like to add a few words about the operation of this sensor when I have 10 liters of fuel the indicator slightly rises to the red line, when I recently refueled 22 liters of fuel, the indicator showed 14-15 liters of fuel, when I have less than 7 liters, it shows nothing and sometimes it will rise slightly, write me where should I start, what will I need, I will be grateful for this is what I like to fix myself without spending money.
Info about the car
1997, 1.8 gasoline

PITERRR wrote:

Hello. Has the float been checked for a leak and is the fuel level resistor operational?

Recently, when I watched the float, it does not seem to be leaky, although on the other hand I saw slight cracks on the frets of this float, and as for the resistor, honestly I do not know what it is, when it comes to the float, I will check it tomorrow and let you know