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Obviously, the float valve ain't sealing well... You mention that it seals if you put your finger on it... Thats more pressure than the valve will ever see.
If you take the float cover off, float still attached, you should be able to turn it upside down, and just the weight of the float itself pressing on the valve should seal it enough that you can't blow through it.
First thing to do though... when it leaks next time, give that float cover a few soft taps with a hammer or wrench or rock.. that usually cures the problem at least temporarily. I have to beat on the carbs in my Jaguar every morning before I take her for a spin... Just its way of asking for a little attention.
-Matt
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