Where is fuel shutoff switch on a 97 mercury mountaineer?

There isn't a readily accessible, easily-found fuel shutoff switch on a 1997 Mercury Mountaineer (like many vehicles of that era). The fuel system relies on the inertia switch (which cuts off fuel in a collision) and the electrical system (the fuel pump is controlled by the computer and ignition system). There's no manual switch to quickly cut off fuel in a non-collision emergency situation.