I would just get a 75-6 gastank and be done with it. Fuel cells are good and the initial buy is cheap enough, but theres a lot of other work involved and in the end a lot of stuff changes, which isnt a bad thing, but to me its one of the reasons I went with a 280. I know some of the 240turbos just used the drain plug as a return, and yes it does work, but they have to watch out in turns anytime the tank is low, how low Im not sure. Another reason I went 280 this time around was teh exhaust/fuel smell, in my 240 I just couldnt get rid of it no matter what I tried, and I had a v8 in the sucker with 10-1cr just pumping the exhaust into my car. There were times I had to stop the car and get out of the thing, my clothes would smell like gas sometimes!
My buddy has a 240zturbo with a ton of mods and 3.7 lsd, and the man cant even get a proper doughnut going because about 3/4 through the first come around, his car will want to stall out on him. He also cant 4wheel it around a turn because of this, or really pitch it hard at all just because of the fear of leaning out his very well built setup. It brings tears to my eyes I bought the man a 75 gastank because he's my boy and I couldnt stand all that proper equipment going to waste like that, besides, when that guy gets faster, I get faster....