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if the pressure sensor is plugged in you are getting a switching signal from the trigger points, the ground leads are tight and the fuel pump is running momentarily and stopping when the key is first turned to the on position and the head temp sensor is providing electrical resistance and is plugged into the harness, then try substituting the control unit and the pressure sensor. Power to the noid is cranking only (make sure that there is steady power to the positive 15 side of the coil when cranking
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