Jim,The plans call for a header tank but 6 gallons is simply not enough. Ron had put together a belly tank out of alluminum. Does anyone know how thick and the type of alluminum that we should use? I know thinner will form better but I can't find in my notes what the ideal thickness or type is. I am thinking about trying to lay up a mock tank. Thanks, jtm
.050" 5052 aluminum is ideal. You should use the belly tank as a source to keep fuel in the header rather than the reverse.
Or, you can weld in a canister around the main pickup, inside the belly tank, and drill small holes in it. (I can send photos). This prevents cavitation of the pump when the fuel gets low or you are in an unusual attitude. With that configuration you can use the belly tank as the main source.
You need to provide mounting hardpoints for the belly tank by using (4) each 3/4inch aluminum tubes welded to both top and bottom skins and passing through the tank. On the original, I used 1" x 1/8" aluminum strap welded to both skins. However, I have since use the tubes since I can pass mounting hardware through the centers rather than depending entirely on the straps.