The collected works of AlArenal

I don't own a Fuel but the molex plug used for the Octane's psu fan is wired differently from standard PC.

Just compare what you have and change the wiring according to what the original fan uses. Colros may differ, but black should stay black. Your new fan probably has yellow in the middle. You probably won't need that (Octane psu's only use black and red), it's for informing a pc's mainboard about the current fan speed.