how do: Fuel Tank

[tracker11]

Hi guys,

I have read that a lot of the racing teams and also trackday drivers drain the fuel tank of their Radicals after one stint.
What is the reason to do that? Check fuel consumption?
And how to drain the fuel tank of the Radical SR3?

I would also like to remove the complete fuel tank for inspection? What is the easiest way to do that?
Remove seat and fuel tank cover to get access to the fuel tank?

BR Dennis