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Is it really necessary to turn off fuel petcock when stopped?

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Someone said the carb works on a vacuum demand so I don't need to turn it off. True?

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Someone said the carb works on a vacuum demand so I don't need to turn it off. True?

No

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That's somewhat true; fuel is pulled into the engine because of vacuum. But that's once the fuel is in the carb.

Fuel from the tank to the carb is gravity feed and depends on a float and a needle in the carb bowel to shut off the fuel flow. If the float gets stuck or the bike is tilted, fuel can continue to flow in even though the engine may not be running.

Always a good idea to shutoff the petcock if your stopped for any length of time.

Jim.

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I turn mine off in the fall and let the bike idle till it dies to burn out the fuel in the float bowl.

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At the end of the ride, I sometimes shut off the petcock, and lay my bike on its' right side, and let all the excess gas drain out of the floatbowl. I usually ride often enough that I don't have gas issues.

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