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Something isn't making sense. If, as you describe, the carburetor is above the gas tank, then an electric or mechanical fuel pump should be present to feed fuel. As such, the fuel pump will effectively limit excess pressure and things should work fine. However, most small horsepower engines that I've seen are gravity feed, e.g. the tank bottom is above the carburetor, negating the need for any form of fuel pump. If that is the case, the bowl valve could theoretically be overcome by excess head pressure from a massive fuel source and cause flooding, but I'm still dubious about that end result.
My concerns about the arrangement are proper storage and venting of any fuel container that will be subject to direct sunlight, heat, etc. and connections which preclude fuel loss and potential of fire.
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There ain't nothin' more powerful than the odor of mendacity -Big Daddy
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