Aluminum foil around gas line?

[Ruth]

Originally Posted by HarleyFLHS

Phenolic block helped mine quite a bit. When running the fuel is going into the engine fast enough that it doesn't boil in the carb, however if you stop and idle in traffic on a hot day, the fuel in the float bowl boils with the ethanol additive we are stuck with in California.

Me thinks California is not the only state that has ethanol in the gasoline.

[2speed]

Has anyone tried having a rubber hose line instead of steel to the carburetor? Would that offer more insulation to the gas?

[Hitman]

Originally Posted by 2speed

Has anyone tried having a rubber hose line instead of steel to the carburetor? Would that offer more insulation to the gas?

I have. It doesn't change a thing, it boils in the carb and not the line. The fuel line is only affected because the metal to metal connection at the carb transfers the heat to the line, and a rubber line doesn't affect that.

[2speed]

So where is specifically seems to boil is between the needle valve and the gas line?


With the needle closed, pressure would build to not let gas flow, but when the fuel is sucked up the venturi, the needle would open, relieving the pressure? Or does the boiling gas create bubbles that lift the float not allowing it to open? Isn't the bowl vented to atmosphere?