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Q: 91 excel injectors sensor on 1991 Hyundai Excel

I am working on a 91 excel, the fuel pump is running and I have gas after the filter to the injectors but I am not getting 12 volts to open the injectors? Where is the sensor and what sends voltage to energize the injectors.
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12 from ignition switch is constant with key on. the ground is controlled by looks at the crank sensor for a trigger. you might want to start there.

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