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The petcock needs vacuum to flow. Apply a vacuum to the other port and that should allow the fuel to flow. Other way is to switch the petcock to prime, If you have a prime feature on yours. That should bypass the vacuum block. If nothing works then there might be a clog in your tank. Try using compressed air to clear the line.
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2009 Ninja 250R SE Green Sport Touring Style:
ZG ST; Symtec heated grips; RAM GPS w/ mUSB; DIY reshaped seat; DIY Givi E21 Sidecases; 15T sprocket 
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