Re: So I starteed pumping out my gas tank.... Look what I found
I have a 62 gal. as well, but if I had to pull it, I have the room. I had a problem when I started this restore project. The old fuel fill hose had disintegrated and all of the "crumbs" went into the tank. I can't tell you all of the havoc that wreaked.
ANYWAY, I set up an electric fuel pump, but I mounted a heating oil strainer and a 100 micron filter inline with it. I drained the tank down, but not empty. Then I pulled through the sending unit hole, through strainer/ filter and dumped back through fill neck. I let it circulate almost all day, untill I wasn't getting any more debris. I kept moving my suction hose around in the tank like a shop vac.
Maybe this would work for you, substituting a seperator for the filter rig?