Use two bean cans and a neck and cap from a metal screw top can. Fairly easy and cost nothing to make. Never have figured out exactly how much it holds but will take most of a one gallon gas can. A coat of black paint and it looks right acceptable.
I was shocked at what people wanted for the old round small engine tanks. That what prompted this tank. http://motorbicycling.com/showpost.p...0&postcount=20