Ethanol will corrode/eat away at rubber. If I remember correctly, the Icebear Fuerza had a sticker on it that recommends/states to use no ethanol fuel.
On that same note... My fuel lines were fine with me filling up at Marathons/Shells. I didn't have any issues.
Best bet is honestly just replace the line with silicone. You can find it on eBay for around $5 to $10 bucks and comes in all different colors.
While you're at it, you can add inline valves around the fuel filter. That way if you ever need to swap the filter you can do it without having to pinch the lines up and stuff.
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