The Problem of Marine Engine Pollution

Until recently, most outboard engines and personal water craft were powered by

conventional carbureted two-stroke marine engines. These traditional engines have

adverse impacts on the environment. Up to 30% of the fuel passes through the

combustion chamber unburned or partially burned, thereby being released

directly into the water and air as pollution.

• In the air, unburned gasoline results in hydrocarbon emissions, which contribute to

the formation of ground-level ozone or smog. Smog can irritate the respiratory system

and aggravate existing respiratory conditions such as asthma.

• In the water, gasoline elevates concentrations of benzene, MTBE, and other toxics.

Low-Pollution Marine Engines are Now Available

The GOOD NEWS is that cleaner, low-pollution outboard and personal watercraft

marine engines are available from Rhode Island marine dealers. These engines are

better for the environment, easier to maintain, and more fuel efficient. They generally cost

more, but the benefits are substantial for the environment, for your boating enjoyment,

and for saving money in the long run.

Fueling

Proper fueling reduces the introduction of

gasoline into the water.

• Ensure boat stability when fueling

• Use a spill-proof gasoline container

• Use fuel collars to capture splash/drips

• Use bilge pillows and engine pads to absorb oils

and fuels, and dispose of them properly

• Close the vent on portable gas tanks when the

engine is not in use or when tank is stored

• Do not rely on automatic nozzle shutoffs, the fuel

filling nozzle should be attended at all times

• Avoid topping off gas tanks

Two Types of Low-Pollution Engines

• 4- Stroke Engines

This technology prevents unburned fuel from escaping

through the exhaust valve, which significantly

reduces hydrocarbon emissions. No oil mixing with

gasoline also improves overall engine performance.

• 2-Stroke Direct Fuel Injection Engines

New technology two-stroke engines feature direct

fuel injection which directly introduces the fuel into

the combustion chamber. As a result, the up to 30%

fuel loss experienced with the traditional technology

is eliminated, with an overall fuel economy

improvement.

Engine Maintenance

Good engine maintenance improves

operating efficiency and reduces emissions.

• Limit engine operation at full throttle, and eliminate

unnecessary idling

• Repair gas and oil leaks immediately

• Check, clean and flush engine away from the water

• Keep engine properly tuned

• Prepare engines properly for winter storage

• Do not fog the engine in the water

• Contain all waste and recycle or dispose of properly