Did a proposal for a biodiesel start-up for a business owner during uni. End result was that rubber hoses beyond 1975~ can handle ethanol. (I vaguely remember that natural rubber would degrade in ethanol) Only watch out was that ethanol cleans your fuel system so best to change fuel filter after a couple of tanks to prevent any blockages. However this was in regards to switching from dirty diesel to biodiesel in trucks so shouldn't be an issue from ULP to e85
Easy way to test is grab an off cut of fuel hose and leave it in a container of e85. Monitor for any changes etc.