Can I use Sea Foam in my boat? It is running rough [SOLVED]

Can/should I use Sea Foam for my boat motor? It is running rough after sitting, and a friend of mine recommended I use Sea Foam.

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Jim D.
Jim D.
4 months ago

Great question, William.

The #1 cause of a rough-running marine engine is heavier suspended fuel gum and petroleum varnish that restricts fuel passageways. The most important thing Marine PRO does is liquefy and clear away sticky gum and varnish restrictions so the engine can go back to starting fast and running strong.

I’d recommend using Sea Foam Marine PRO (though the classic Sea Foam Motor Treatment will work too). If the rough performance is caused by gum and varnish, Marine PRO will clear up the problem. It’s made with 100% safe petroleum cleaning and lubricating ingredients, so it’s okay to use in your boat.

Here’s what I’d do:

Wait until you have a low tank of fuel (1-3 gallons). Add a full can of Marine PRO to the fuel. Run your boat at least 20 minutes if you can (just don’t run out of gas!), and don’t be afraid to run it hard. Then, refill your fuel tank as normal.

For upper engine cleaning (fuel injectors/carburetor circuits & chamber deposits that can affect running performance), it works much better to add the full can to a low amount of fuel for two reasons, 1) the cleaning concentration is considerably greater and, 2) the cleaning effect will start much faster with greater effectiveness. If you were to add Marine PRO to a high volume of tank fuel, it might take several hours of engine running for a lower concentration of the treatment to work its way through the fuel lines and through the engine. Understanding the concentration approach will go a long way in terms of understanding how Sea Foam’s engine products work for overcoming fuel residue restrictions or a rough-running engine. Pay attention to starting, smooth idle, throttle response, hole shot, acceleration, and top speed. If the problem is caused by fuel residues, Marine PRO will help overcome it. Either way, it will do a good job cleaning up your engine.