I just bought a KF IV that's been setting for 10 years. I stumbled across a post about fuel smells and some sort of tank issue. My plane has evidence of a tank or line issue at the upper aft corner of the right door. I have not had time to work on it yet as my truck needs attention first. But I'm getting confused as to what issues I may find with 1991 vintage tanks. I just emailed the former owner as to what fuel he was using, so I hope to have that info tomorrow. Some posts I read are related to some sort of release agent coming off, and some are about tanks coming apart inside. Can anyone give me an idea of what I should be looking for?