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If you can determine the area of the crack or pinhole, it can be fixed buy drilling appox. 3/32" holes to let the gas drain and then set aside in a warm area to allow the gas to evaporate. Occasional use of compressed air will help
(don't apply air pressure to the float).
You can tell if the evaporation is sufficient by smelling it.
Then it's just a matter of soldering to seal.
Have done several in this manner with success.