Yes, I may have been on to something! Great info, I'm going to check the voltage on mine for the hell of it. I will say when I start the car the pump is at 100% and it whines pretty loud until the controller steps down the voltage.
Did you do a voltage drop across the power feed from the control unit and at the FP module? It may go through an intermedate connector somewhere and you could have high resistance. Subscribed!