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Electric does work. It is efficient, and uses less power than a mechanical pump. Many cars cannot eliminate the mech. pump because it is driven in the serp. belt system or the timing belt system. Building an idle within these systems would be difficult. Also, some pumps use the block as part of the back of the pump, this provides some difficulties as well. as for speed, for $200 you can buy a pwm to control the speed. I would not use a resistor.
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