2007~2015 CX-9 Issue with fuel level reporting?

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Mazda cx-9 2008
Hello. Did any of you have a problem with indicating the fuel level? My cx9 from 2008, when I bought it 2 years ago, has the wrong indication. The fuel pointer goes down to 3-2 dashes on the scale and the end of the fuel. It will not go any further and the reserve lamp will never turn on. The clock test is ok. I took the pump with the indicator and thought the problem was solved, it is still the same. I found information that there is a second fuel gauge under the second seat. I pulled it out. Moving the pointer I saw that the indicator on the dashboard was working up and down. Looks like it's working. What could be damaged? Some kind of fuel overflow system in the tank? the tank is divided into two. Why does the status display not go to the reserve? It shows about 15 liters of fuel and the car does not start and I have to add fuel.
 

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