You know.... The vacuum in a fuel tank will drain the fuel lines but NOT the carb.

SO, if you think the fuel in the carb can actually evap over a few day's, (I don't) then this evap theory v/s the tank not being vented can indeed make it hard to start.

BUT!

I run this schitty gas in my 61 falcon 1V carb that's vented and even after sitting 2 weeks there is PLENTY of fuel in the carb to start it....

Boiling to evaporate it is what I am going to back up, boiling then a bit of vacuum in the fuel tank to help pull fuel from the lines back twards the tank....

Any creedence to my assumptions?

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Let us bow our heads and Murff