1986 V65 magna sub-fuel tank clogged. or understanding the inner working of? V65 sat for 13 years on patio. gas was left in tanks. I have replaced fuel pump and filter, cleaned the gas on/off switch inside and out. unable to clear the inner tube from aux tank to on/off switch so that gas may flow. how do I clear it? I cleaned inside of tank with gun cleaner. seemed to do the best job without damaging anything. still clogged. can´t see inside far enough to figure out what is causing the problem.