Rubber fuel line isn't effected by gasoline. It's neopreme. For high pressure steel line, if it's by the fuel filter, GM makes a kit that replaces the fittings and a small section of line.
730-4933 for $37.94
730-4929 for $24.66
Don't know which is what, but they used one of each to replace both ends on by fuel filter on my 85 Impala. The fittings were rusty and junk.
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HERS
90 IROC-Z 350 TPI--Summer 00 Bravada--Winter
HIS
86 TRANS AM 406 TPI--Summer 05 Rainier--Winter
85 Impala--Work car
BIG TOY--68 Triumph Bonneville
little toy--72 Honda Mini Trail 50 | 
