1999 Volvo Penta "WT" Models Workshop Manual, Page 18Get this manual
See the boat's Operators Manual to determine if the boat's fuel system is compatible with alcohol blended fuelsIf it is, your engine may use gasolines blended with no more than 10 Ethanol (ethyl alcohol) meeting the minimum octane specificationDo not use any gasoline which contains METHANOL (methyl alcohol)INotel Continued use of METHANOL (methyl alcohol) fuel will cause serious damage to the fuel systemIf you use gasoline containing alcohol, be aware of the following: The engine will operate leanerThis may cause engine problems such as vapor lock, low speed stalling, or hard starting Alcohol blended fuels attract and hold moistureMoisture can cause fuel tank corrosionInspect fuel tanks at least annuallyReplace corroded or leaking fuel tanks Frequently inspect non-metallic parts of fuel system and replace if excessively stiff, deteriorated or leaking& Fuel leakage can contribute to fire andor explosion
Crankcase Oil