I found gas tank of engine for the starting up. I was told that it was for Bf 109, but i don't think because i didn't see pictures whit this type of engine tank.
If that is the part shown in the pictures above it's a coolant tank, not a fuel tank.
The shape of these tanks changed on the Bf 109 as the engine installation and bearers changed and I don't know if your tank is from a Bf 109.
Based on the shape and assuming the large cone shape item is a drain, it looks like it fits in the wing of something. I'm really not sure the 109 had a fuel tank in the wing.