If simply removing the hose doesn't work, try removing the entire gas cap. Please be careful when testing.
The cap might have a check valve in it that is stuck, perhaps due to some plastic flash from the mold process.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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