![]() ![]() This is more of an issue for older “pre-fuel injection” engines that have a carburetor.Ī fuel injection system is closed and under pressure when the engine is not running so fuel is not exposed to air. Modern fuel can begin to deteriorate and oxidize in as little as 15 days. Use marine-specific fuel stabilizer at the correct ratio in every tank of fuel to prevent oxidation and phase separation. ![]() Carry a spare filter element on board (check with your engine manufacturer for the best size filter).A 10-micron water-separating fuel filter between the fuel tank and the engine will keep water and contaminants out of the engine. Some high-performance engines may require a higher octane rating than “regular” 87 octane. The owner’s manual may also specify a minimum fuel octane rating. Ethanol attracts water and can absorb moisture from the marine environment through the fuel tank vent system, and it’s possible for that water to settle out of the fuel (phase separation) on the bottom of the tank, which could cause the engine to not operate or be damaged. When possible its best to avoid ethanol all together when fueling up a boat. ![]() E15 is becoming more prevalent across the country but is not always obviously labelled. There are also many older marine engines on the water, especially in freshwater areas, that were manufactured before any amount of ethanol was common in motor fuel and are thus often incompatible with ethanol fuels unless the system is updated. The fuel system components of the boat and engine are not designed to tolerate the corrosive effects of an ethanol blend higher than 10 percent. ![]()
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