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It certainly sounds fuel related, and if your fuel is oxygenated it will make the situation worse. If you are using metal tubing within the engine compartment, or near the exhaust to transfer fuel, replace it with rubber tubing, or braided hose as the metal tubing will transfer to much heat to the fuel or attempt top insulate it real well. The same holds true for a fuel log bolted to the manifold or cylinder head.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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