How Can I Control the Fuel Pressure With a Mechanical Fuel Pump with a Carburetor

In the old Days we used a carb by pass valve. that doesn't adjust the upper Pressure and Idle Pressure Both .

We now use our Aeromotive Dual Pressure Regulators 13132 and 13139 . They work first time every time to allow any idle pressure and any high rpm pressure - Available here at Alkydigger - simple to use .