SeaFoam

[Ghostshad]

My boat has sat for a year our so, i just filled it up was fresh gas .Is their anything better than SeaFoam marine out there ?

[GaryH]

[Motoboss]

16 hours ago, Ghostshad said:

My boat has sat for a year our so, i just filled it up was fresh gas .Is their anything better than SeaFoam marine out there ?

No

[gim]

Hopefully you filled it up with ethanol free premium gasoline.

[rboat]

I like using the marine stabil with every tank fill up. 

[GRiver]

What’s better? I don’t know, I use sea foam marine. Along with ethanol free gas, mine sat for 2 1/2 years when I got it.

I mixed it rich with sea foam marine on the first start up, and haven’t had an issue.

[Way2slow]

Seafoam help prevent gas from breaking down.  Back in my Mobility Command days in the military, the government claimed it was good for a year.  Personally, I would never run gas that old in an outboard, I don't care what kind of witch's brew it had in the tank.  Done seen toooo many destroy pistons from old gas that has loss octane.

The major problem you have with letting one sit that long is not the gas breaking down as much as you have with it just evaporating out of the carb bowls and fuel system on the engine, leaving that gummy, lacquer build up that plugs the jets and everything else.  As far as bad gas, if its too bad, the motor not going to burn it.  If it's still good enough that the motor will burn it, but has lost octane, which it will do rather quickly, self-detonation is going to destroy the top of the piston.  

 

If you look at the bottom of the carb bowls, (side near the bottom) they usually have a big brass screw (main jet access plug).  Take that screw/plug out and look at the back side of it.  If it's not clean brass, and has a coating of crap on it, you had just as well plan on rebuilding the carbs or you will stand a good chance of melting a piston from leaning the engine out.   

That's why when I winterize or plan to putting one away for a while, I pull all those plugs out of the carbs and purge the fuel system with low pressure air.  I've had motors sit for years and still start and run just fine doing this.  

 

One other things, your granddaddy and daddy may have done this but it's not a smart thing to on a motor that sits out.  Don't disconnect the gas hose and let the motor run until it dies.  Doing this completely purges the crankcase removing all the gas and the oil film that is left on the moving, steel parts inside it.  This makes them very susceptible to rust from condensation, which they will do heavily on cool mornings and the sun shines on them. 

[WRB]

To be safe you transfer your gasoline to a vehicle that uses lower octane gasoline if the fuel isn’t 2 cycle mixed with oil.

Stabilizers only work in fresh gasoline, not old weakened fuel.

You can add Boostane to the gasoline when transferring to your vehicle to help off set octane loose. 

Boostane Marine is a good additive to fresh gasoline for high performance engines or less expensive Stabil or Seafoam Marine stabilizes fuel about 6 months.

Tom

 

[GRiver]

I should probably redo my previous statement…. My boat had been sitting for 2 1/2 years but, no fuel… tank had been removed. I want to kinda clean up the carb from sitting, when I pulled the plug in the carb bowl. It looked like it hadn’t been run dry, it ran pretty rough on first start up, but it cleared up and has been doing fine.

II would try to get rid of all the old fuel, even get an 12v fuel pump and pump it out. Think you’ll be happier in the long run.