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Sure, the carb can leak if the float is stuck in the “sunk” position and/or if the needle valve isn’t sealing. You occasionally hear situations where people come to their boats after a few days’ absence and smell fuel. This can be why. But the actual amount of fuel leaked is going to be pretty small.
This (and other fuel leaks, ie pinholes in fuel tank) is what you are heading off when you smell for fumes and run the blower every time before starting the engine.
If this happens with a running engine, it’s likely to make the engine run rich, not leak. But if the engine stalls, the OPSS exists to turn off the fuel pump and prevent a big leak from occurring.
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