It used to be that fuel tanks were merely a rectangular tank, but that was long ago. Since then the shape and complexity of fuel systems has changed dramatically. That certainly does not simplify the production of it. So choose LASE to optimise your production processes.
The fuel system is designed at the very end of the process when all other parts, such as the motor, the suspension, the drivetrain and the interior have already been finalised. That explains why fuel tanks have the most complicated shapes and why it is necessary to use all sorts of integrated techniques so that the fuel system would fit into the car. In the case of a hybrid vehicle the situation is even more challenging.