Have you wired a 12v relay onto the pump so it gets constant 12 volts ??? Im not sure if 32's suffered from this problem like 33's.
If you start the car in the morning how long does it take before the problem starts ?
You have a full tank now ?? start it up in the morning and take it for a normal drive and tell me how long it takes before it gets noisy and does it lose power before it gets noisy ?