Fibreglass Tank Question

[Blanco]

I have a Caswell-lined fibreglass tank and wondering if I should, or need to, remove fuel mix while storing over the winter (Canadian) and if so, should I replace it with something or okay to leave empty. For my street bikes I just top up tank and add a bit of stabilizer. I asked my neighbour who owns a boat and he says it should be fine if it's treated/lined as it protects from ethanol. Thanks in advance.

Edited 12 hours ago by Blanco

[ERW]

I would not leave fuel with ethanol in any motorcycle over the winter regardless of the tank material. Stabilizers may be helpful in preserving fuel but I would not count on them. Even though your tank is coated I think it is still a bit risky to ever use ethanol containing fuel in a fiberglass tank.

[feetupfun]

While it's probably OK to leave fuel in it, it would be kinder to the tank liner to store the tank dry over winter. Nowadays after a ride, I drain and dry out my lined fibreglass tanks if it will be more than a few weeks until the next ride. My oldest epoxy tank liner is about 20 years old now. For the first 15 years I left that one with fuel in between rides and it gradually changed from honey colour to dark brown over the 15 years. After I noticed this happening I started draining it between rides and now at 20 years it is still working fine. It may still have been OK if I had continued leaving fuel in it, but the colour change made me wonder if it was being gradually damaged structurally. 

For info, Caswell liner is epoxy resin