As I understand it, and I have no doubt I will be told if I am wrong;
this is a two point control system with an inlet metering valve on the pump (insert any acronym)essentially controlling the low pressure flow of fuel into the high pressure pump. constant 12v gives no flow so high amp (current)reading means less flow and 0v gives full flow e.g. less amps increase flow. a decent test for this regulator is to unplug it and it should increase fuel pressure. therefore pressure decreases with current.
The second point of control is the Rail pressure control valve which controls the pressure in the rail by controlling the fuel return, essentially it is a tap, turn the tap off it creates high pressure in the rail, turn the tap on a gradually it lessens the pressure in the rail. this works opposite to the inlet side as when it has 12v constant (high amps)it is closed so full pressure in the rail, when it has 0v low amps it has no pressure in the rail. so rail pressure increases with on time (PWM)therefore pressure increases with current.
both regulators work by controlling current (amps)by switching the voltage to the component using pulse width modulation (PWM)
longer than I anticipated but I hope it helps someone.
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