Moin I am currently converting 2 cars to the stockcar car with a few colleagues (see link in signature). Now we ask ourselves what we can take as a tank!? according to the regulations where we are going to participate, must be in the interior room! We want what is stable, is not expensive and at the same time where we can see how much is still in the tank, because this is important because we can only have 5 liters of fuel in the tank! What can you take?