One of the prime needs of your vessel's internal combustion engine(s) is clean fuel. On many boats, an effective Fuel Filtration System is often overlooked when the boat is manufactured. With today's fuel injected gasoline powered boats, fuel quality must be almost pristine to avoid problems with these engines. Contaminated fuel can cause the myriad of electronic sensors on these engines to give all manner of improper signals to the engine's computers and also give improper diagnostic codes to the mechanic attempting to troubleshoot them. Diesel powered boats usually have a fuel filter on board, but even those can be upgraded to ensure that contaminant free fuel is getting to the engine.
Whether you have a gasoline or diesel powered vessel, the proper care and feeding of your boat and its total fuel system will provide you with many happy and trouble-free hours of boating pleasure.
The Proper Care & Feeding of your Marine Fuel System
The most common problems usually begin with the introduction of water into the fuel. Water is commonly found in fuel systems and can come from a variety of sources. Condensation, fuel handling and environmental conditions are the main causes of contamination. Humid marine environments will increase the presence of water. Water contaminated fuel can lead to very severe engine damage if it is not detected and treated. Contaminated fuel contributes to damage caused by oxidation (rusted metal parts) and suspended particles of iron oxide, microbiological growth and sulfuric acid damage, normally seen in diesel fuel. Fuel provides lubrication to the fuel injection system. Water displaces the fuel's lubricating qualities increasing the chances of premature wear and galling.
Most factory installed filters such as those found in carburetors, fuel pump canisters and engine mounted filters, do not have the capability of removing water. For this reason, the addition of a quality fuel filter/water separation unit is absolutely necessary to prevent the causes of engine damage. On most small gasoline powered boats, this can easily be accomplished with the addition of an accessory spin-on style fuel filter/water separation unit. These inexpensive units are commonly available at most marine supply stores and boat dealership parts counters. Be sure to size the system for your engine's horsepower and fuel flow needs. These filter assemblies are usually very easy to install near the fuel tank in your boat. Always include a couple of replacement filters to add to your boat's spare parts locker. If you encounter a bad case of water contamination while underway, which is caused by the fuel sloshing around in the tank mixing with the water, you will have the ability to drive the boat home rather than row it if you carry extra filters. This is because the water in the fuel will not pass through the filter and will plug the filter media decreasing the flow of fuel. You will notice this as a marked reduction in engine rpm's which usually gets worse. Remove the contaminated spin-on filter, put it in a bucket for proper disposal later, and install a fresh filter. When you get back to shore, check into the problem as soon as possible to avoid further damage. When installing a fuel filter/water separator on your boat, be sure to follow United States Coast Guard guidelines for materials used and mounting locations.
An important thing to always remember is DO NOT use automotive fuel system additives or fuel dryers. This is because most of these products contain alcohol which ATTRACTS water into the system, compounding your problems. Always use marine fuel additives.
Diesel fuel systems, though more complex, will benefit greatly with the addition of a properly selected fuel filter/water separation system. Any vessel making long distance or offshore passages will be best served using a duplex system. This system uses two or more filters with a manifold and valve that allows the engine to continue operating on one filter while the other filter is being serviced. Most of these units utilize a vacuum gauge to determine filter efficiency and forewarn you of impending blockage. Vessels not going offshore will be improved with the addition of a properly sized single fuel filer/water separator assembly, but a dual system, though more expensive, provides an excellent margin of safety and reliability.
PBT Distributors, Inc.1317 Oakdale Road, Suite 1110Modesto, CA 95355 USA