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    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 .