I`m a dummy at this, but I have read quite a bit on this subject, so I`ll give you the info I have come up with on your question.
If your running a cooler on the return line, then mounting the regulator in the engine bay, I think from my research, would be the best place.
The fuel controller you mentioned lowers the voltage going to the pump. That in itself can cause problems to the fuel pump. What is needed is a PWM (pulse width modulator) that sends about 12,000 pulses of voltage to the pump, which seems to be the best way to go from what I have read. There is an aftermarket pump that is internally pwm modulated. I`ll have to dig that pump up for you to see, but it`s for a fuel injected motor. I have yet to find an external pwm module to control the speed of the pump at lower rpms. I believe this is how late model factory vehicles control their fuel pumps
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