If I can suggest something to the OP (and others contemplating a conversion). My understanding is that the OEM flex fuel vehicles include a flame arrestor - fine stainless mesh across the pipe diameter - in the fuel filler neck. It might be worth fitting that as it's there for a reason. I have yet to see someone convert to E85 and state that they did include the arrestor so two things come to mind:
One is seldom fitted.
The risk associated with its absence is small.
I would still want it to be there though.
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