4 Common Boat Fuel Problems And How To Solve Them For Boaters

Few things ruin a perfect day on the water faster than boat fuel problems. One minute, you're cruising across the lake, soaking up the sun, and the next—your engine sputters, coughs, and leaves you stranded. Most fuel-related issues don’t happen overnight; they build up over time due to contamination, poor fuel quality, or neglected maintenance.

The good news? A little prevention goes a long way. Understanding how to keep your fuel system clean and functioning properly can save you from expensive repairs, lost time, and major headaches. Whether you're a weekend boater or a full-time lake enthusiast, staying ahead of fuel issues means smooth sailing every time.

Water Contamination in Fuel

Water in the fuel system leads to poor performance, stalling, and potential engine damage. It can enter the tank through condensation, leaks, or contaminated fuel. Believe it or not, sometimes the water in the fuel comes from the on-water gas stations.  Typically after the winter when their gas has been sitting in their storage tanks but the moisture rich area by the lake.  Ethanol-blended fuel absorbs water, worsening the issue. If left unchecked, water can cause rust in the fuel system, degrade fuel lines, and create harmful deposits inside the engine.

Solution:

To prevent water contamination, the easiest solution is to use an additive.  Google Fuel System Water Remover to find a few different options . If it is a common occurrence use a high-quality fuel-water separator. This device removes water from the fuel before it reaches the engine. Regularly check the separator and drain collected water. Inspect fuel tank seals, gaskets, and venting systems for leaks. Keeping the tank full minimizes air exposure, reducing condensation buildup. Avoid storing fuel for long periods, as older fuel is more likely to attract moisture. Choosing non-ethanol fuel helps limit water absorption and helps keeps the fuel stable longer.

Improper Octane Rating For Your Boat or PWC Engine

 We have found that some people are so afraid of ethanol that they only put non-ethanol gas in their boats and jetskies. You MUST check the minimum octane rating of your boat or PWC before fueling them up.  Low octane levels can damage your engine.  

Solution:

I (Hunter Croan) have 3 boats that have a minimum octane of 93 required.  Our local access to non-ethanol gas is only 90 Octane.  If I use the non-ethanol gas, I must use an octane booster for those 3 vessels.  Also in the spring and summer when my boats and PWCs are used often, I typically use the more affordable 93 octane which does have some ethanol in it (compared to 90 Octane non-ethenol).  I use the boats enough during those times of year that the ethanol does not have time to go bad.

Bad Fuel Quality

Old or contaminated fuel leads to engine problems. Ethanol-blended fuel degrades over time, causing gum and varnish buildup inside fuel components. Poor-quality fuel from discount non-brand fuel stations may also contain excessive water, rust, or other debris, resulting in poor combustion and hard starting.

Solution:

Don’t be the first boat of the season to use the on-water gas station pumps.  Use fresh, high-quality fuel from reputable suppliers. If storing fuel for an extended period, add a stabilizer to slow degradation. Avoid using fuel sitting in the tank for months, as it may have absorbed moisture or lost its combustibility. Drain and replace old fuel before long trips. Periodically inspect the fuel for any signs of separation, cloudiness, or strange odors, all indicating contamination.

Stale Fuel from Long-term Storage

Fuel in a boat’s tank for an extended period can degrade, leading to difficulty starting the engine and poor performance. Ethanol in fuel attracts moisture, leading to phase separation, where water sinks to the bottom of the tank and the fuel loses its combustibility.

Solution:

Add a high-quality fuel stabilizer before storing your boat for long periods to prevent fuel breakdown. Run the engine for a few minutes after adding the stabilizer to distribute it throughout the fuel system. If old fuel remains in the tank for months, consider draining and replacing it before use. Keep the tank as full as possible during storage to minimize moisture buildup.

Fuel Your Waterfront Lifestyle with The Lakefront Group

Fuel problems cause significant headaches for boaters, but most issues can be prevented with regular maintenance. Keeping fuel clean, inspecting components, and using quality fuel will help avoid breakdowns and keep your boat running smoothly. A proactive approach to fuel system care saves time, money, and stress on the water.

The Lakefront Group specializes in helping buyers and sellers navigate the unique world of waterfront properties. We do more than just sell waterfront homes for sale in Texas; we know how important a well-maintained boat and fuel system is for maximizing lake life enjoyment. Whether you're selling a lakefront home or looking for the perfect waterfront getaway, we bring deep market expertise, strong negotiation skills, and a passion for the lake lifestyle.

Contact us today to learn more about our available listings and expert real estate services.