I got the green Marine Sta-Bil at West Marine for $29.95 a quart. Felt kind of dumb when I saw it later at Academy for like 15 bucks less. Oh well, I've had worse problems...

Am I ok then using it on my normal 2-stroke fuel system where I CLOSE the vent on the tank when in storage, or should I be leaving the vent open if I use marine stabil? Didn't know about this "vented" requirement or what it means really...

yes it is OK ,
Just that baots, lawn equipment have a vented fuel system, this is what lets the humid air in and this is where you get the moisture from.

just run your boats engines evry week and you will not have problems with the gas

I have started doing this also. If I'm not going to get it out for a few days I put the muffs on and run it a little. Just preventative maintence "I hope".

I'm sticking with Seafoam. I'm very impressed with how the carbs stay clean even after sitting up for a while.

OK, thanks for the clarification on the "vented" thing. If it's designed for vented where humidity is always getting inside (like my old boat with built-in gas tank) then it ought to be even better for tanks that have a closable vent.

I bought a big bottle (treats 320 gals) today at O'Reilley's in Terrell for $23.99.

And, btw, I noticed a quart bottle of the old red stabil treats only 80 gallons, and a quart of the marine stabil treats 320 gallons. So apparently, it's much more potent stuff and may be cheaper per gallon in the long run.

pep boys and cajun sea foam does nothing about ethanol , marine stabil does , and i dont think seas foam is meant to be run in every tank

You are correct on that. Seafoam should be used before or after you tune up the engine.

I pull the plugs and squirt sea-foam and let it sit, then start it up and spray the foam through the carbs while running (best to do on the trailer at the boat ramp) at the end of the can shut off the engine and let it sit for a hour or so, start it up and cruise around the lake, change plugs and away you go

i was told by EAGLE MARINE in ft.worth that sea foam clogs up a carb. thats after i spent 150.00 on a carb cleaning,went to lake and run boat maybe a mile and now it wont start . sea form cant clog up a carb that easy ,,,thats bull s@%$@

If there is a lot of junk in your gas tank it is possible that the Seafoam could free it up and cause it to stick in the carb. The Seafoam itself did not clog up the carb.

Seafoam has never caused any issue for me. When I first started using it there was a lot of smoke and the motor ran rough until all of the gunk was cleaned out. Not anymore.

From this link Seafoam

SEA FOAM Motor Treatment
The Choice of Professional Mechanics for Over 65 Years

Safely frees sticky lifters and piston rings, removes carbon
build-up and oil residue, reduces pinging and rough idle.

For Carbureted or Fuel Injected Gasoline Engines - Autos � Trucks � Tractors � Motorcycles � Marine � Small Engines � Industrial Engines

Great for Diesel Engines Too!


SEA FOAM Motor Treatment is a 100% pure petroleum product that safely and effectively cleans internal fuel and oil system components, helping your gasoline or diesel engine run cleaner and more efficiently. SEA FOAM is an EPA-registered product, and will not harm engine components, seals, gaskets, catalytic converters or oxygen sensors.

SEA FOAM liquefies gum and varnish deposits or internal engine components, removing carbon deposits, freeing sticky valve lifters and rings curing rough idle, pinging and hesitation problems. By using SEA FOAM to eliminate varnish and carbon buildup, mechanics can more accurately diagnose mechanical problems that may exist. That is why Sea Foam has been so popular with professional mechanics for over 65 years.

As a fuel system additive, Sea Foam will clean fuel injectors, clean carbon, gum and varnish deposits, add lubricity to fuel, [color:#FF0000]stabilize fuel for 2 years and control moisture.

As an oil system additive, Sea Foam controls moisture, gum, varnish and residue deposits. [/color]

91 CAJUN HAD NEW GAS TANK NEW LINE ,, THEY R FULL OF CACA

Very interesting link below.... I thought I might start adding more to my gas other than Ring Free and I stumbled upon the following link:

http://www.fuel-testers.com/is_gas_additive_safe_with_e10_list.html

I think I will take a wait and see position.....

Agreed but, in my case and many others, you are mixing oil with the gas. With oil injection there is no way to run the carb dry after use with out doing special preparation. Hence, if it sits for a while in the Winter the carb gets gummed up. I dont' have near the problem like before if I use Seafoam in the tank regularly. I don't have to rebuild the carbs and clean them after sitting for a while. My $0.02.