Sounds like you may have a fuel restriction between the tank and the lock off. If it has a bulkhead filter (domed shaped thing about the size of a golf ball) in the line from the tank, that may plugged up. Turn the tank off, drain the fuel from the hose and look in there. Also make sure the hose fitting that connects to the tank is on all the way and does not have an extra rubber washer stuck in there.
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