Gillie,
E 10 is also causing other problems. Does your needle valve have a rupper tip? If so, they may get soft and stick shut.Lean and mean is not good in this application.
The bowl gaskets are also swelling and hanging the floats open. Gas flowing under the cowl? Also bad. My carbs are plastic as is my vro pump and rubber lines etc.
I found a place to get non e10 90 octane locally and this may work in other places. I asked the assistant at the Buccaneer where they buy gas. Charles Brown oil co. I just
got my forms.
Gated and pass card protected. Auto deduct weekly from my debit card. Gas is for recreational use only and costs the same as the corner BP.
GFS