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I doubt you'll get enough torque out of an R/C motor. And, as I said, you can get the speed control and power saving with your current motor by running a PWM control to it (and bypassing the resistors).
I paid about $5 for a PWM circuit off ebay that's good up to 90vdc and 15 amps. It's smaller than a deck of cards.
BTW, I think some of the return-less fuel systems are already being controlled by PWM directly from the ECU.
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