Why do you need a button with an image of a petrol tank in the passenger cabin?

The Jaguar X-Type has an inertial sensor for disconnection of the fuel in the accident. This is done to minimize the risk of fire. In the case of an accident (and sometimes just after a wheel hit a large bobbin), the fuel supply is turned off, and the machine stops getting started or starts almost immediately. You need to press the button to restore the fuel feed.