ok found the little holes in my rear tank...hard to miss...now question is how do we get the tank down and out. We got the spare out and straps loose but something, I am thinking the fuel lines, is hanging us up. May have to drop my receiver hitch too but that is not stopping us as of yet.
96 F250 btw
what can I use to fill the holes for now. three are pin holes one is the size of a pea

 

Replace the tank w/ a 38 gallon one. check for it in the search area. also do the vent/fill mod & poss fuel line upgrade. I'm in the middle of it right now not hard. some guys got a tank from Rock Auto through here, I went to locak radiator shop that sells tanks too, got tank for $145.00 cash & carry. If all is removed to drop the tank & its still not droping, prob fuel lines. S/B 2 lines (1 feed 1 return), a vent/roll over line & electrical connector for guage (no in tank pump). If $$$ allows you may want to do the electric fuel pump conversion now as well.