Where is the 93 Ford Explorer Fuel Cut off Switch?

Look down where the front seat passenger puts their feet, towards the left side of the footwell there by the tunnel. Pull the carpet cover back and there it will be!

Firewall is the panel between you and the engine.

Heater box is the plastic air flow distribution unit, forward at the bottom of the console, on top of the tunnel, just behind (towards the rear of the car from) the firewall.

Cheers!

dr bob

Due to the small, slow child from another planet comment I'd like to add that it's a small button, and I think it's red. But it might be black. Anyway it should be the only button down there.