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Vapor lock was far more common in older gasoline fuel systems incorporating a low-pressure mechanical fuel pump driven by the engine, located in the engine compartment and feeding a carburetor.
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My pump is in my tank nowhere near any heated fuel, as I explained there is no return line.
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The boiling point of gasoline varies. At atmospheric pressure, it's between 100 and 400 oF. A primary cause of this variance is the various additives in the gasoline from different refiners designed to meet different octane requirements.
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So in the winter there's almost no way it will be vapor. But it wont be -10.
Gasoline isn't even flammable, only its vapor is.
So no one has any experience with this application at all? I searched for threads on this motor with no luck.