Where is the fuel shutoff on a 1985 ford f 250?

On a 1985 Ford F-250, the fuel shutoff is typically located on the fuel pump itself. It's not a readily accessible, easily manipulated switch like you might find on newer vehicles. You'll likely need to access it from underneath the vehicle. The fuel pump is usually near the fuel tank.

Important Note: Accessing the fuel pump involves working with gasoline, which is highly flammable. Take extreme caution and follow proper safety procedures, including disconnecting the battery's negative terminal before starting any work near the fuel system. If you're not comfortable performing this task yourself, it's best to have a qualified mechanic do it.