Boat Fuel Tanks
Boat Fuel Tanks
How to Troubleshoot a Boat Engine
Powerboats, or speedboats as some people still call them, those boats with gasoline powered engines, can be a bit more difficult to maintain than those powered by oars, an electric motor, or a sail. The problem with powerboats, however, can be keeping them running reliably. There is nothing worse than finding yourself in the middle of a lake or out on the open seas with a boat engine that won’t start. No boater should be helpless though. Some basic troubleshooting knowledge can go a long way. Many problems can be fixed out on the water and other problems can be identified at the dock or in your front yard. Let’s explore some basic boat troubleshooting techniques and get any land lover started on their way to powerboat pleasure.
We don’t expect to solve every boating problem by any means however all powerboaters should be familiar with some simple troubleshooting techniques. OK we’ll start off with an easy one. You are in your yard and decide to start your engine before heading off to the water and to connect your ear-muff and garden hose for cooling. The boat doesn’t even attempt to turn over. First thought would be a dead battery. Before removing the battery, check the battery connections for tighness and cleanliness. Second use a voltmeter on the dc setting and check for 12.3 volts or something slightly higher. Low voltage indicates a dead battery. Suffucuent voltage may mean loose or corroded connections. Good battery voltage and no attempt to turn over the motor may mean other electrical problems in your ignition circuit. The battery can be diagnosed rather than blindly removed and recharged.
Let’s say the boat turns over but doesn’t start. This is fairly common. The engine either lacks fuel or lacks spark to ignite the fuel. To check for spark you can remove one spark plug at a time and attempt to start the engine. With the spark plug grounded to the engine, or anyhting metal bolted to the engine, you should see a rhythmic sparking at each plug. Laxk of spark at any one spark plug indicates an ignition problem and may need professional troubleshooting at your local marina depending on your skill level. Reasons for lack of spark could be a loose tether, bad ignition coil, faulty cdi box, loos fan belt, deteriorated plug wires, fouled spark plugs, bad distributor cap, worn ignition points, or corroded wiring in the ignition harness.
Good spark at each plug can indicate a lack of fuel into the engine at the time of starting. Troubleshooting your boat’s carb or fuel injection system can be more involved but determining a lack of gasoline is still a good start. Basic causes of fuel starvation in your boat’s powerplant can be an empty fuel tank, broken fuel line, clogged fuel filter, clogged injector, dirty carburetor, or loose throttle cable. Learning how to troubleshooting a boat can be fun and rewarding, even if you can’t repair the problem, diagnosing the trouble can still save you some cash at the marina. As for troubleshooting out on the open water, you may be surprised at the numerous problems that can be corrected on the water with a multimeter and some basic hand tools that probably should be on board anyways.
About the Author
Chet maintains How To Troubleshoot, dedicated to troubleshooting articles as well as repair guides and how to guides.
Mariner 40hp not getting fuel?
I have a Mariner 40 hp electric start engine on my boat. New fuel tank, new fuel line & ball. New fuel filter.
When I pump the ball up stays hard, filter fills with fuel. Yet engine not getting fuel to carbs. Will run off spraying carb cleaner directly into carbs, but dies once it burns that off. Any suggestions?
(Carbs are clean & fuel bowels seem ok)
Check your fuel pump and sender
Anatomy of a RIBCRAFT Rigid Inflatable Boat, Part 4
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