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For a DIY mod I see no real reason not to drop the pump speed (and flow) down when the fuel demand is low but keep the manifold vacuum referenced regulation as the final determinant of fuel pressure. i.e. reduce the amount of fuel being returned to the tank.
In a naturally aspirated i.e. non-supercharged engine, maybe a MAP sensor input (0-5V)into a solid state relay configured as an op-amp?
I'm not sure that there is much potential to save electrical power but it would be an interesting project to do for the fun of it.
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