Have you tried swapping the hoses over on the back of the bubble?
Sounds like either the one way valve in the bubble is faulty, letting fuel flow in the reverse direction, or the hoses have been switched by someone. If it is the valve that is faulty, there may be some dirt in it that needs cleaning out. Remove the hoses and blow compresses air into the sockets while pumping the bubble.
Most likely has a leak in the system, I suggest replacing the bulb as well as the lines, replacements are usually fairly cheep.
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