Ah yes... been there, done that
Problem is that the 2-stroke mix is very oily (presuming it's a 2-stroke of course), so gluing it with anything at all is going to be tricky. After a good clean with an industrial solvent you might try a hot glue gun across the seam.
Failing that, I've carefully successfully melted cracked plastic tanks back together with a good hot soldering iron - once the tank had been thoroughly evacuated first. See if you can find a tank or whatever made of the same material and cut a strip from it to add to the cracked area as you melt it. These seams are never as strong as the original material, but they are certainly better than epoxy.