mgf wrong fuel gauge reading

Hello,

Yesterday I filled up the car and the fuel gauge reading moved from 20% that was before to 60%....

I normally dont fill the tank .. but this time seems to have had enough gas inside (the meter was 15% just above the red line)... so with 30 litres the tank overflowed...

The needle today is still at 60% didnt go up to 100%

Something wrong with the gauge I suppose... I dont even know where it gets readings from... gas pump?....

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