now that we have the whole story, I’ll agree…go with two wire pump. Convert one of your hots to a neutral. Just mark it as such on each end. The NEC allows this.
Going to a two wire pump means either a less powerful motor or the motor will draw more amperage (now you’ll only have 110Volts instead of 220V so amps (current)goes up. Your current wires may not be big enough for more current so you may need to choose a smaller pump.
