Investigate with power off and boat well ventilated. Check the bilge with your nose. Really strong gas fumes are probably not just a stuck float valve. It could be something like a loose hose fitting above the tank which only leaks when the tank is full. Jolting on the trailer is not likely to create a new leak. Do not start the engine before checking for fumes and fixing the leak. If you can smell gas fumes anywhere but at the carb air intake, it is serious.
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