How to sell a full car design which will run without any fuel?

I have designed a complete car.Which will run without any kind of fuel.I also have made a small sample of its engine for experimental verification of my design.Now I want to know where and how to sell my design?

The first step is to see a patent attorney and get a patent. If you can prove that it works and you hold the patent, you won't have to look for people to sell the design to. They'll be chasing you.

In the mean-time don't disclose anything about it to anybody.

wawa,it's wonderful and enough unthinkable，the car having no fuel also work