Hi , a simple question arose in my head , why is that every time I have seen a hose attached to a gas tank being set on fire the fire always burns out of the end of he hose but the fire never travels backwards inside the hose back to the tank to explode it. the same I suppose happens to a gasoline pumps hose which you normally stick in your cars fuel tank , i assume if you would lite it on fire and hold it open the fireball would never travel back inwards into the hose. Why is this so? is it because there is pressure and fluid/gas coming out so fire cannot get in or also because in the hose there is very little oxygen so the flame cannot go back more so it stays at the end of the hose where the fluid/gas stream meets fresh air (oxygen) ? what happens when the pressure of the gasoline or gas ends up and the hose begins to drip could the flame catch backwards inside the hose then ? and travel to the tank and if there would be the right amount of fumes make it explode then ? this has been shown many times in movies both correctly and incorrectly so i wonder. thanks.