Well, I have egg on my face, all this time while I was having problems with my g38, I had changed fuel line, had carb rebuilt, done everything I knew to do, today I finally had to pull out the tank and when I tried to get the stopper out, it had come almost apart. There were small bits of the stopper in the bottom of the tank, this is where all of my trouble was comming from. Needless to say, I do not feel so smart right now. What is the best tank to use for gas about 16 to 20 oz. ?

Any tank, but you had the wrong stopper. You need to get a gas stopper for your Dubro or Sullivan tank