what I am trying to do is tracking fuel while running like a real F1 car
No, that does not answer my questions. "Track Fuel" does not tell me what you are doing with the data.
Let's say that together, we all create a system that lets an on-board system determine that you have 47% fuel remaining. What should that on-board system do with that data?
Is it going to remain on board for some decision making process?
Is it going to be transmitted to the pit? If so, what is going to be done with the data in the pit? Just displayed on some device for the driver to know? How does this info help the driver?
what do you mean exactly by your method ? I did not understand it :/
I will be glad to give better detail but let's wait until you help us understand what you are trying to do.
what do you mean by "The advantage of this is that there will be no physical change to the fuel system." ?
Here too, let's wait until you help us understand your goals.