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I’m thinking of using a PWM motor speed controller with a Holley red pump.
I got the controller from amazon. I’ve bench tested it with the pump and it works good.
The idea is to be able to adjust fuel pressure to the carb by adjusting the pump speed instead of dead-heading against a inline fuel pressure regulator.
 

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The idea is to be able to adjust fuel pressure to the carb by adjusting the pump speed instead of dead-heading against a inline fuel pressure regulator.

A lot of modern EFI equipped cars have a Fuel Pump Driver/Module rather than a Fuel Pressure Regulator. You've already bought one and tested it so what is your question?
 
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