Why won't the still (for bio-feul or moonshine) work?

My kid made a basic still to make bio-feul (moonshine) as a science project. She made it from a tea-kettle, copper tubing & a thermos (coiling the copper tubing through it). She soaked & fermented all the veggies. but when she cooks them in the kettle it won't raise into the tubing. What is she doing wrong? show more My kid made a basic still to make bio-feul (moonshine) as a science project. She made it from a tea-kettle, copper tubing & a thermos (coiling the copper tubing through it). She soaked & fermented all the veggies. but when she cooks them in the kettle it won't raise into the tubing. What is she doing wrong?
3 answers 3