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How much power would your pump use at 6V anyways? I feel like it can't be more than a lightbulb or two.
The way I'd do it is probably buy one of those single channel PWM fan controllers, wire in a bigger MOSFET and maybe a capacitor (just in case the pump isn't happy with the PWM, it can affect longevity), and have it connected to the gas pedal so that it speeds up when you put higher loads on the engine, and have it "idle" at 6V when you're not on the gas.
To save even more money you could wire up a PWM controller yourself but I hate trying to figure out more complicated circuits.
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