** I HAD THIS ISSUE AND FIXED IT **
I've put in a picture to explain the part I'm talking about, I would have taken pictures of my own but now that I've fixed it im not splitting it again.
The metal that has the Zeus logo on it has an opening for air and an opening for liquid, it is connected so tightly that it seems that the chimney itself doesn't disconnect from the liquid fill hole (but it does) mine had a gap which was about 1/2 mm right up at the top, this was making the liquid pour out, I covered the metal in fabric to protect it and very gently popped it back together in a vice (you will hear the pop) the leaking stopped after this.
Sorry if this doesn't make much sense I'll try and explain it better if someone needs help
I've put in a picture to explain the part I'm talking about, I would have taken pictures of my own but now that I've fixed it im not splitting it again.
The metal that has the Zeus logo on it has an opening for air and an opening for liquid, it is connected so tightly that it seems that the chimney itself doesn't disconnect from the liquid fill hole (but it does) mine had a gap which was about 1/2 mm right up at the top, this was making the liquid pour out, I covered the metal in fabric to protect it and very gently popped it back together in a vice (you will hear the pop) the leaking stopped after this.
Sorry if this doesn't make much sense I'll try and explain it better if someone needs help