[3rd_gear_Ted]

Today's gas formulation and fuel cells bladder material compatibility would be my concern long term.
The foam inside the bladder is the next concern, it does degrade

"ATL fuel cell replacement SF103 foam renews the anti-slosh, explosion suppression, and safety of your cell. The SF103 foam kits are ATL's most popular for gas and limited alcohols, and are available in many sizes, densities, and styles for a variety of cells. Although engineered to last, high alcohol content in fuels will impact the life span of the foam. Inspect your foam quarterly, and when you need to replace, go with ATL."