Does a 1988 Chevy pick up have fuel safety switch?

No, a 1988 Chevy pickup truck does not have a fuel safety switch in the same way that some later model vehicles do. While there are safety features related to fuel, such as the inertia switch (which cuts off fuel in a collision) and the various sensors in the fuel injection system (if equipped), there isn't a dedicated switch that actively cuts power to the fuel pump based on a specific event like an open door or unbuckled seatbelt. Those types of switches were more common in later model years.