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Where is the fuel cutoff valve located on a 1994 Chevy S10 4.3 Vortec?

The fuel cutoff valve on a 1994 Chevy S10 4.3 Vortec is incorporated into the fuel pump module inside the fuel tank. There isn't a separate, easily accessible valve like you might find on some older vehicles. To access it, you'd need to drop the fuel tank.