I'm in the middle of replacing the fuel pump on my 00 GT. This Delphi pump came with a new 4 pin harness that says I have to replace the stock one at the pump side or I could experience issues. Looking at the original harness and the new plug they look identical. Why would I have to replace the plug if all I'm doing is replacing the entire assembly? I really don't see the point of hacking up a perfectly good working fuel harness just to wire in a new plug???