updates on project problem child

[60ratrod]

ok so i finally got the motor put back together a few weeks ago and running again, after getting a money shot from my motor cause i forgot to hook up my mechanical oil pressure gauge line(which was rather funny). it runs really good, although my motor now leaks oil ranther badly, but i think that it may either be my front oil pan seal or my fuel pump seal. but one question that i have is my tank has a lot of rust sediment that my buddy and i thought we fixed the last time we cleaned out the tank, how do i get rid of all of the rust sediment that is in my tank and keep it from coming back??