Hmmm, @K-woppa, you offer a valid point, I'll have to look at that aspect, basic condition/amount of coolant (extreme engine heat?) I've not confirmed actual tank venting as well. Admittedly, some stuff that hadn't occurred to me yet. The heat aspect is present, not coincidental. Fuel lines do closely follow against the hot crankcase. Hmmmm.....When you said engine heat I was expecting you to say "vapor lock" next.