Curious about predator engine with different gas tank.

Mini Bike & Go-Kart Parts

I own a late sixties bird duck mini bike With an old beat up motor and a cool fuel tank that I like. I really want to get rid of the old motor yet keep the fuel tank so I was curious if I bought a predator 212 do I have to use the gas think that comes with it or can I attach the rubber gas line to any gas tank?
Thank you.