Why boats need non-ethanol gasoline

Ethanol absorbs water

Standard gasoline contains ethanol, which absorbs moisture from the air. A car uses its fuel quickly, so this rarely matters. A boat is different. Its fuel tank takes in humid coastal air and often sits for weeks between trips.

What happens in the tank

Once the fuel absorbs enough water, it separates. The ethanol and water settle at the bottom of the tank, where the engine draws its fuel.

That layer burns poorly and corrodes the components it passes through. Over time, it can leave sludge in the tank.

Can I put 87 in my boat?

It is not recommended. Most regular 87 gasoline sold at gas stations contains ethanol. It can reduce engine RPM and power and cause knocking, and high-performance engines should not run on it.

Older boats face an added risk

In older boats, ethanol can also wear down fuel lines and loosen buildup from the inside of the tank. That buildup can then clog the fuel filters.

How to prevent it

Use non-ethanol gasoline. Refuel after each trip rather than before the next one, so the tank stays full and holds less moist air. Replace fuel filters on a regular schedule.

Of these steps, non-ethanol gasoline is the one that addresses the problem at its source.