Hello, i have a 1991 Lexus LS400, heres the problem, i know this car has a dual speed fuel pump, well one day, the car was acting like it was low on gas when u give it gas it acted as if it was struggling to get gas, i check the voltage at the fuel pump and it read 9 volts, well i know when the car is floored it should go back to 12 or so volts then back down to 9 when in idle and such, well its stuck at 9 volts, like a relay is stuck, i replaced the fuel pump relay and the capacitor thing with metal fins on it that cuts down the voltage.. i did a voltage test at the capacitor thing and its constantly getting voltage, its like theres something telling it to always go threw the capacitor to lower the voltage to my fuel pump, i hear there is another relay somewhere called a fuel pump speed control relay , is this true? and if so , where is it? and what could be causing this problem, i would really appreciate some help thanks