HOW TO USE MARINE PRO FUEL TREATMENT
IN BOAT ENGINE FUEL
BENEFITS
DIRECTIONS
treatment recommendations
SUMMARY
Add Marine PRO to every tank of fuel to help your marine engine start faster, run smoother, and last longer. It works through fuel injectors and carburetors to safely remove harmful engine residues and deposits from fuel passageways, intake valves, pistons and chamber areas.
Marine PRO is safe and effective in all 2- and 4-stroke gasoline marine engines, inboard and outboard. Marine PRO only contains petroleum-based cleaning and lubricating ingredients. It does NOT contain harsh chemicals or abrasive detergents that could harm your engine. Marine PRO does not contain alcohol.
HOW TO USE SEA FOAM
marine pro
RELATED QUESTIONS
Hi , my 1990 Mercury 90hp 2 stroke motor doesn’t run smoothly. Can I add Sea Foam Marine PRO to fuel that already has engine oil added for my Mercury 2 stroke motor to clean the carburetor?
Thanks for the question, Kevin. Yes, you can add Sea Foam with fuel that already has oil mixed.
Here’s what I’d do: Wait until you have a low tank of fuel (1-2 gallons). Then, 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. After that, refill your fuel tank as normal.
Here’s a (rather lengthy) explanation of why a high concentration works best. 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. The #1 cause of each of these issues 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.
Can I add Marine Pro to the engine oil on a Mercruiser engine?
My motor won’t start. It wants to just won’t fire up. It has been sitting for a couple years. I drained the fuel and put new fuel in the tank. The engine is a 2007 4p horse mercury.
Thanks for the question! First off, here’s an article on our site about common boat motor problems and what causes them. It’s a good checklist for troubleshooting.
https://seafoamworks.com/how-to-prevent-or-fix-boat-motor-problems/
If your Mercury has been sitting a few years, there’s a good chance the fuel system is dirty and causing the problem. Here’s a step by step from our “How to clean a gummed up gasoline carburetor” sheet:
- Check condition of spark plug(s).
- Drain or siphon the old fuel from the tank.
- Drain each carburetor bowl.
- After removing gasoline from the tank and carburetor, add a mixture of Sea Foam Marine PRO followed by 8 ounces of fresh gasoline (1 to 2 ratio).
- With the cleaning mixture in the fuel tank, crank/prime/rope-pull the engine to draw the cleaning mix into the carburetor(s).
- Allow engine to sit and soak – Overnight to 24 hours if possible, 48 to 72 hours when
- Once the engine starts and runs, Sea Foam in the tank will continue to dissolve residues as fuel is drawn through the carburetor.
- Add more fresh fuel when ready to operate engine under load (working engine).
For more detailed step by step instructions, check out this pdf of the process:
https://seafoamworks.com/wp-content/uploads/2024/04/HOW2_Gummed-Up-Carburetor.pdf
Hope that helps and let me know if you have any other questions!
What is the ratio of Sea Foam Marine PRO to gas?
Good question! For routine preventative maintenance or storage, add at least one ounce of Marine PRO per gallon of fuel.
For the best cleaning results, here’s what I like to do: Wait until you have a low tank of fuel (1-2 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.
Here’s a (rather lengthy) explanation of why a high concentration works best. 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. The #1 cause of each of these issues 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.
Hope that helps!
Will Marine Pro clean any varnish/gumming from inside my fuel filter housings that are inside the outboard? Suzuki 250ss four stroke
Jim D.TECH
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