2005 yamaha v-star 650 There is a rubber line that comes from near the fuel shut-off valve, and terminates at a connector attached to one of the cylinders, located behind the air-filter. The end of the hose, where it attached to this connector, is open. No plug, and I do not see any other hose that could have come loose. When the ignition is turned on, fuel begins to stream out of this open-ended hose.

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Sounds like the fuel line came loose from fuel injecter, fuel rail. Look for a nipple at pressure regulator valve or fuel rail, if regulator is in tank with fuel pump. Let me knmow how that works out.
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