The fuel pump is getting louder because you bypassed the ballast resistor. It's a load resistor, and it's purpose is reduce the voltage to the pump after starting to prolong the lifespan of the pump and to reduce noise by lowering the operating voltage. Sure you can bypass it; but it's not a good not a good idea. It may last or may not depending on corrosion at any power or ground splice/connector joint in the fuel pump circuit. Check all these points for corrosion, clean them up, and if the pump is still noisy, get a new 1.3 ohm ballast resistor, and replace it. Unless you enjoy replacing fuel pumps prematurely. :ack: