Do you stop filling your tank when the auto shut off on the pump stops or do you continue to "pack" your tank? If you do thats probably what ruined your canister. May be too late for you this time, but it might save you or someone else this woe in the future.
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"Half the people can be part right all of the time, and
some of the people can be alright part of the time, but
all the people can't be all right all of the time."