I'd like to begin the process of bringing a 824KF back to life after languishing in my garage for 4 years. I mailed the carbs out for a rebuild and now I need to deal with old congealed fuel in the fuel lines. She has a mix of metal and rubber fuel lines. My first inclination was to pull out and redo all the lines for safety sake. Is this overkill? Is there a safe way to clean it all out?