Okay, so many if us where running into aluminum carb and fuel modules in boats after switch to e10 many years ago. I deal mostly with mercury outboards and mercruiser inboards. Issues subsided once a fellow marine mech told me about pulling fuel line from tank and putting it in a small remote tank with 40:1-50:1 premixed fuel and a splash of stabilizer. Run engine until you see skight blue smoke from tailpipes. Done ! Fuel module/pump/ metal fuel lines/injectors /carb bowls/etc all lubed and protected for storage.
Mercruiser caught wind after we where posting this secret sauce around the bigger boating sites, other mech’s, marina’s etc, where trying it, and then found it to wirk snd then started suggesting it. They call it soup. Lol.