There for had return line been in accordance with rotax installation manual that would not have happened.
Facts are that foxbat did not install return line there for by your own admission you are at fault.
Get with it fuel under presure will boil stop making out that it's not happening ROTAX have had the return line to the tank for more years so for you to say it is not required is bulxxxx so sue me if you recond that that you know more than ROTAX.
I am talking ROTAX 912 series motors not bloody GA.
What size was the fuze ?neil