I have a fuel leak coming from my fuel tank, it is coming from my fuel pump

Replace the pump module/assem! No the pump doesn't pressurize the tank. Be sure it IS leaking from the o-ring seal before you make any repairs.

First your fuel tank does not get pressurized by the pump. As far as what you need to do to fix the leak there may be no way to know for certain without dropping it down far enough to see. The O-ring isn't likely to just start leaking, has there been work done to the fuel system lately?