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Does the fuel pump in a 1998 Chevy Blazer have kill switch?

No, the fuel pump in a 1998 Chevy Blazer does not have a separate, dedicated kill switch. The fuel pump is controlled by the PCM (Powertrain Control Module) and will shut off in various situations, such as the ignition being turned off, a crash sensor activating, or a fault detected by the PCM. There's no readily accessible switch to manually cut power to the fuel pump.