A fishtank pump would likely flow enough water to keep heat in the engine compartment, Ben. A resistive heating element, as NiHaoMike suggests, would probably be sufficient to heat the fluid. I think you can do this whole project for $50.
Both parts are 120V as well, so you could run them off your pack voltage, I think. The fishtank pump, maybe not, though. If you can't use it, a 12V fuel pump might work out for you instead.
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