The 1997 Chevy S10 Blazer doesn't have a readily accessible, manually operated fuel shutoff valve like some older vehicles. The fuel system is controlled electronically. To stop fuel flow, you'd need to disable the fuel pump (which requires disconnecting the electrical connection) or deal with the fuel pump relay. These are not typically under the hood in a convenient location and accessing them may require some mechanical skill.
Important Safety Note: Working with the fuel system involves potential fire hazards. If you're not comfortable working with automotive fuel systems, it's best to consult a qualified mechanic.
