Many thanks for the useful advise.

A mate of mine owns cars/buggies and is more than happy to take this fuel off my hands i will advise him about adding a little extra oil - I will also purchase the correct fuel for my plane in future[:@]!

As far as the tank vibration issue goes I believe this is the main cause of the foaming in the tank, it was a rather tight fit in the compartment and could only get foam top and bottom of it not on the sides (theres only about a 3mm gap around the sides of the tank)
I changed the lines inside and out but still no good, pretty sure it's a vibration issues which is causing the foaming.

I guess the only way to eliminate this is to purchase a slim tank, and maybe check the spinner is not out of balance or something.

Thanks for the help team,

Cheers,

Sweetdudeplanes.