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According to XDI not only is it pressure, its volume along with it. I don't know exactly what needs to change.. only guessing.
The pressure has to go somewhere it can't just be electronically un pressurized. And there's no return back to the tank. So possibly they're altering pulse width? Somehow forcing the lpfp to reduce volume until enough fuel is requested that it fully opens up again? I don't think the cam lobe the pump runs off of is variable. But maybe it is.
I'm really as lost as you are. But 35% more fuel and more pressure has to go somewhere.
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