Quote:
Originally Posted by chrs1961815
It is not absolutely necessary for short drives like that. It does of course depend on how well the valve actually works. If it doesn't work well, your carb will fill up and might leak which is why people turn it off in the first place.
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The carb will fill up only if the float valve is also faulty. To get fuel leaking from the carb, BOTH valves must let fuel past. Turning off the shutoff is a worthwhile safety measure so long as it seals IMO.