Here's a video of a fuel dispenser, opened up, with an engineer explaining it. https://www.youtube.com/watch?v=q3phjAQZdGg https://www.youtube.com/watch?v=q3phj

Here's a video of a fuel dispenser, opened up, with an engineer explaining it. https://www.youtube.com/watch?v=q3phjAQZdGg https://www.youtube.com/watch?v=q3phjAQZdGg Really helped me understand what was going on.