The circuit goes from the main bus -> relay -> inertia switch -> the pump -> ground.
The relay is triggered by the computer. The ground leg of the shutting coil on the relay goes to the computer. The computer then grounds this leg to fire the relay and turn on the pump. I have seen faulty computers that refused to ground that pin. Test all aspects of the relay and relay connector to verify them. The cold could be affecting the ECU or the relay.
Fuel pump relay should be under the driver seat on an '88. If not it is under the hood by the AC relay.
Mike
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