Most gas sold in Florida contains up to 10 percent ethanol, and while that is fine for your car, ethanol fuel problems are one of the leading causes of outboard engine trouble. Ethanol attracts moisture, breaks down quickly, and can leave behind deposits that clog carburetors, injectors, and fuel lines. For boaters on the Treasure Coast, understanding how this fuel affects your motor is the first step toward avoiding expensive repairs.
What Causes Ethanol Fuel Problems
Ethanol is hygroscopic, which means it pulls water directly out of the humid Florida air. When enough moisture collects in the tank, the fuel can separate into two layers in a process called phase separation. The water-and-ethanol layer sinks to the bottom, right where your fuel pickup draws from, leading to hard starting, rough running, and even engine damage. Ethanol can also dissolve older rubber fuel lines and loosen deposits that then travel through the fuel system.
How to Prevent Fuel-Related Damage
The good news is that a few simple habits go a long way. Always use fresh fuel, and try not to let gas sit in the tank for more than a few weeks. Add a marine-grade fuel stabilizer designed to combat ethanol, and keep your tank as full as possible to reduce the air space where condensation forms. Replacing your fuel filter and water-separating filter on schedule is also one of the cheapest forms of insurance you can buy. When possible, using ethanol-free fuel gives your outboard the best protection of all.
If your motor is already showing symptoms like stalling, surging, or difficulty starting, have it inspected before the damage spreads. Our certified Mercury technicians can clean the fuel system, replace worn components, and get your engine running the way it should.
Trust the Treasure Coast Experts
Staying ahead of ethanol fuel problems protects both your engine and your wallet. To keep your motor healthy year-round, read our guide on how regular outboard maintenance protects your boat investment, then contact our Stuart, FL shop to schedule a fuel-system service today.
