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That is indeed a rubber covering over the steel fuel lines. The rubber cover can harbor & hide corrosion in the steel lines. Are you sure it is not fuel seeping out? (the odor is usually quite obvious). If not, it could be just water that had made its way down to a low point. Have you washed the car recently or driven in rain/puddles?

I'd want to peel back the rubber cover to inspect the fuel line. If it looks good then the puffiness is not a major concern. It could be due to some spilled fuel during a pump/filter change that adversely affected the rubber.
 
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