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Message: <blockquote data-quote="Dave1234" data-source="post: 141405" data-attributes="member: 23099"><p>At the risk of asking the obvious, did you try to re-route the exhaust and muffler?  Try home made double or triple wall ventilated exhaust piping, or ceramic insulation between the heat source and the carb?  electric fan to blow on the carb/insulation gap?  re-plumb the carb further away from heat or below the fuel source so there is no lift in the lines to get fuel to it?  Raise the fuel tank (even if temporary as a test) or add a fuel pump , re-plumb your manual bypass valve up to the driver area so you can adjust it manually without getting out,?  Is it possible there is some clogging in the shrouding of the engine forcing too much hot air in the direction of the carb?  It seems like getting a fuel injection system to work well automatically is going to take  a computer to balance it all out (But diesels and early corvettes ran without all that , so there must be a simpler way that I don't know of.)   Ultimately, you know that gasoline doesn't just immediately evaporate whether winter or summer--it takes time at atmospheric pressure.  Eliminating fuel vacuum conditions and excess heat in the fuel system ought to resolve the problem.  No doubt winter fuel is designed to evaporate at a lower temperature.  Your system must have been really marginal even before gas changed with the season.  I doubt lead had anything to do with it.  If you wanted to check, I think aircraft gasoline still has lead in it, but it might not be adjusted for the season so might no tell you anything definite.</p></blockquote><p></p>

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