Fuel lines have degraded since the inside since the beginning of the combustion engine. Ive had them go in cars, I find the ethanol fuel is harder on the carbs than the lines, Forget stabil and all that crap. Start your motor , shut off fuel, and let run till it stalls. Then turn it over and spray fogging oil down the carb with the butterfly's open. ..works for all my motors. No issues. I do tear down the carbs on the sleds at the beginning of every winter as they are tuned on the ragged edge of lean. Snow blowers, weed eaters and chainsaws get put away dry and fogged and rarely have any issues.