I will check everything as you told me. 
The fuel gauge doesn't move. Anything.
At first, 6 liters, doesn't move. I think it's not enough. 
But with the next 15 liters, not any movements.
Maybe, the fuel meter inside the tank, in the last 4 years that's been parked, it's stuck.
Hope it auto fix it in the next recharges!! 

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