1988 "CC" Colt / Junior thru 8 Models Service Manual, P/N 507659, Page 87Get this manual
Fuel Tank Servicing
Drain and flush the tank at least once year, and at every tune-up or major repair Drain tank at an outdoor location, away from all possible sources of ignitionA drain screw is provided in the fuel tank upper housingClean the tank by flushing with clear gasoline or solventPrimer pump, screens, etc may be inspected and cleaned as described belowRefill the tank with the correct fuel mixtureCleaning and Inspection If the tank or hose appears to be leaking fuel or fumes, pressure test tank and hose assembly before doing any disassemblyClean the fuel tank and inspect for rust or leakageReplace tank if badly rusted or if it has developed leaks in the metal body
i though these materials are sold as being suitable for fuel tank
repairGenerally, these materials are sold for repairing automotive fuel tanks and are not suitable for portable marine tanks which are subjected to much higher pressure and vacuum condition Never use patched or repaired fuel tank that could allow fuel leakage