Can I add Marine PRO to a half tank of old gas in a 2 cycle outboard? [SOLVED]
My boat sat for a year and a half and has a half tank of old gas. It has a 2 cycle outboard motor. Would it be a good idea to add a whole can of Sea Foam and top off the tank with fresh gas, and run the engine for 20 minutes or so to clean out the old gas in the engine?
Good question, Dave. The best practice would be to drain the old fuel and start fresh with 2 gallons of fresh non-oxy gas and a whole 20 oz can of Marine PRO.
If the fuel is only a year and a half old, though, it should still start and run fine. The goal would be to create a high cleaning concentration of Sea Foam to fuel so it can clean up any fuel gum or varnish that formed while the boat was sitting.
What I’d do: Add a full 20 oz can of Sea Foam Marine PRO to your half tank of fuel. Run it for 20 minutes to burn through the treated fuel. Then, top it off with fresh fuel. You can add another can of Marine PRO if you want to the fresh fuel. It’ll continue to clean as you use up the tank, as well as prevent fuel gum and varnish from forming.
Jim D.TECH
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