Eh, I keep my 3 chainsaws, trimmer, leaf blower all filled with fuel and haven't had an issue. I do run them once every month or so to keep fuel flowing.
Problem I've had in the past when emptying fuel systems for long term storage is the diaphragms in the carb tend to harden. Fuel vapors can also expand and stretch plastic tanks if the fuel cap isn't cracked loose.
The fuel line breakage pictured here is more likely due to age and nothing more.
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