Thanks for the question, Mark!

Since the boat has been sitting for about 4 years, you’re on the right track by draining the old fuel first. Fuel gum and varnish is the #1 concern after sitting that long.

I’d recommend using Marine PRO. Here’s what I’d do:

• Drain the old fuel from the tank and carb.
• Add a small amount of fuel with a high concentration of Marine PRO (1–2 gallons of fuel and 1 can of Marine PRO). The higher concentration works much better and faster to clean fuel  gum and varnish than adding it to a full tank.
• Start the engine and let it run long enough to draw the treated fuel into the carburetor. If it runs, operate the boat for at least 20 minutes. Don’t be afraid to run it hard once it’s warmed up.
• After you’ve run the treated fuel through the system, refill the tank as normal.

That treatment will do a good job cleaning the fuel system.

Once you get it running well again, I’d recommend adding 1 ounce of Marine PRO per gallon of fuel to every tank. It’ll help keep the fuel system clean and prevent the fuel from degrading while the boat sits.

Thanks for the question!

Yes, you can use Marine PRO and STA-BIL Storage together in the same tank. The two products are compatible and won’t interfere with each other.

That said, Marine PRO will protect the fuel from degrading and preserve ignition vapor on its own, while also cleaning and lubricating the fuel system.

For storage, I’d recommend adding at least 1 ounce of Marine PRO per gallon of fuel, then run the engine for about 10–15 minutes to make sure the treated fuel is drawn through the entire fuel system before storing the boat.

Hi Charles,

Thanks for the question! Yes, you can add Sea Foam Motor Treatment to your 60 gallon tank. Add 1 ounce per gallon of fuel. You can get 1 gallon jugs of Sea Foam Motor Treatment at most auto parts stores. Adding it to a full tank of fuel will prevent the fuel from degrading and prevent gum and varnish from forming while it sits. It’ll also clean and lubricate the entire fuel system. It’s a good preventative maintenance measure for every tank and a good way to keep the engine running well and prevent problems.

If you want to run a strong cleaning concentration periodically, wait until you have a low tank of fuel (1/8 tank or so) and add three or four 16 oz cans of Sea Foam. Run it for at least 20 minutes if you can (just don’t run out of fuel) to give the treated fuel a chance to clean.

Hope that helps and let me know if you have any questions!

Best,

Conner

Sea Foam

Hi Mark,

Thanks for the question!

Yes, that’s a great way to perform a deep cleaning on an engine that has been sitting.

Here’s what I’d do:

• Add Marine PRO to the fuel tank at a cleaning concentration (at least 2 oz per gallon of fuel). It’s best if the tank is relatively low to maximize the treatment concentration.

• Start the engine and bring it up to operating temperature, then shut it off.

• Remove the old fuel filter and install a new one filled about 3/4 full with Marine PRO.

• Start the engine and let it idle for about 5 minutes to pull the high concentration of Marine PRO through the fuel system.

• Shut the engine off and let it soak for about 10 minutes.

• Restart the engine and run or operate it for at least another 10 minutes.

Fuel gum and varnish is the #1 cause of many fuel-related performance problems in marine engines that have been sitting. The high concentration of Marine PRO works very well to liquefy and clear away those deposits.

Thanks for the question, David. Use Marine PRO. It will clean and lubricate the entire fuel system, as well as prevent gum and varnish from forming in fuel. Works great in marine applications.

Here’s how I’d recommend using it depending on what your goals are:

• For routine, everyday maintenance: add 1 ounce of Sea Foam per gallon of fuel. It does come in 1-gallon jugs that you can get at NAPA or other auto parts stores (you might have to have them order it, but I looked up a NAPA in your area and it said they could ship to store for pickup the same day). Adding Marine PRO to every tank of fuel is best practice for keeping a fuel system clean and preventing common fuel-related problems
• For periodic high-concentration cleaning, wait until you have a low tank of fuel (1/4 tank or so), add a high concentration of Marine PRO (at least 2-4 oz of Marine PRO per gallon of fuel), and use up as much of the treated fuel as you’re comfortable with before refueling.