Guests - If You want access to member only forums on HSO. You will gain access only when you Sign-in or Sign-Up on HotSpotOutdoors.

It's easy - LOOK UPPER right menu.

  • Announcements

    • Rick

      How to create an @mention - Click Here   07/16/2015

      You can use the @mention aspect whenever you want someone to be notified about a post or let them know you are talking about them. Type the @ symbol type in a couple "lowercase" letters pause then once the names pop-up either select or keep typing in letters to narrow down the list until you get the @mention name you are looking for. You can play a game so members can see how it works. If you want to practice or If your name has been @mentioned below you should see it in your notifications (upper right) and you then have to @mention one or two members who haven't been mentioned inthe comments section below. Let's see how long we can keep this going. Anyone who duplicates a name that has already been @mentioned loses. This is the first group to be @mentioned to get the ball rolling: @Borch @Scott K @Corey Bechtold @Matt Johnson @mrklean @eyeguy 54 @Finns @IceHawk @MarkB @Cliff Wagenbach @Wayne Ek

Fill it or not

Recommended Posts

I have a Crestliner pontoon with a built in gas tank.  The manual for the boat said that the 17 gallon gas tank should be filled in the fall.  I have done that and used the non-oxy gas and stabil.  When I first got the boat it would go 22 miles per hour in calm water.  Now the best it will do is 19.3.  I think a major factor is that the gas sits over winter.  I don't use the 17 gallons until very late in the year, in fact I haven't used it all for the past couple of years.  I store the boat in an unheated pole barn up near Stacy MN.

Should I fill the tank or not?  If I don't what are the downsides?  I assume condensation but I wonder how much that will be and whether it is a big issue given the use of stabil.

Thanks for your time.


Share this post

Link to post
Share on other sites

Dump in a bunch of Sta-Bil.  Then fill the tank right up to the top,   where you can SEE the gas (if possible) and call it good. It is better if you can run the engine for a short period to make sure the Sta-Bil is getting into the fuel system so it is laying in the lines and carburetor (assuming you have one) or injection system.

Nuttin' to it.

Share this post

Link to post
Share on other sites

I have thought about the condensation issue and even did some calculations.  I have decided it is not a significant problem, at least here in Minnesota.

But gas getting stale is a problem I know people have had.   The Techs that winterize my motor said to not bother with filling the tank, but just put in fresh gas in the spring instead.  So I just store it with whatever the amount of gas happens to be.  

My buddy who has a 70 Suzuki 4 stroke on his pontoon has noticed that stale gas in the spring makes the motor run bad(ly). 

Share this post

Link to post
Share on other sites

My boat has a 41 gallon tank. rarely is it ever full and I will never leave it over the winter with a full tank of gas.

Here is what I do. When I know I am getting to the last few uses of the boat for the year I will make sure I have at least a half tank of non-oxy gas and pour in a full bottle of sea foam. No stabil for this guy. Stabil has a shelf life of like 3 months so who knows how long it has sat on the store shelf before you purchased it.

Sea foam has other benefits and a fuel conditioner and system cleaner. Win Win.

Come Spring when the boat comes out the tank is then added to or topped off with fresh non-oxy gas.

Ive been doing this for 20 plus years with various boats, snowmobiles, etc and have never had a fuel system related issue.


Share this post

Link to post
Share on other sites

I look at it this way. People started using heat/isopropyl in their gas originally as a way to bind water that is in the gas an prevent it from freezing. When they started to add ethanol it served the same purpose. The only time it becomes a problem is if there gets to be more water through condensation in the gas than the alcohol can absorb but if that happens, having no ethanol/alcohol in the gas doesn't fix or make it better. The problem is water and filling it with gas eliminates the chance of condensation and thus you should not need to add products like stabil or Sea Foam. 

Sea Foam contains like 20-25% alcohol itself so if your concern is the ethanol in the gas this is no cure for that part. The rest is just petroleum based solvents that can dissolve buildup but you can get Naptha or other products from a paint store much cheaper to do that job. 

If I had to pick one method that would be bulletproof it might be to fog the motor with any sort of product you felt comfortable with and then drain the tank completely and leave it dry over the storage season. Obviously any moisture in a metal tank can cause corrosion so make sure it's dry. Then, prior to the next activity, verify the tank is clean and dry, clean and dry it if it isn't and then fill with fresh gas before you use it. That way you know the tank was clean, dry and the gas is good. 

Share this post

Link to post
Share on other sites

I think the gas tanks in most boats and pontoons are plastic these days.   I am pretty sure the one in my boat is and it is a 1998.   And the neighbors' pontoon tanks are plastic as well.    So rust is not an issue. 

The problem to be solved is that gasoline deteriorates in storage, with the RFG (reformulated gasoline) containing ethanol going bad faster.   That is why folks are getting away from filling the tank for storage.  

As for whether seafoam or StaBil or other products do much to keep the gas from deteriorating, that is an open question in my mind.   I haven't seen any tests from anyone objective, although I haven't looked very hard.   

I don't think condensation is a problem in the winter in our climate, since there just isn't much water vapor in cold air, especially below freezing. 

Share this post

Link to post
Share on other sites

How much extra weight have you added to the boat with Gear and dump?  That could take some top end off.

I doubt it is the gas.  I fill up my tank with non oxy and add the marine stabil at end of the season. 

Then it is ready to go for the next season,


Share this post

Link to post
Share on other sites

Neighbor's 70 suzy four stroke on his pontoon has definitely had performance issues in the past when running on old gas in the spring.   Put some new gas in and it ran better.  

I have not noticed any such effects on my Suzy.  

Apparently gas will oxidize slowly even at normal temperature just from exposure to the air.   This oxidation produced gums and other bad stuff and degrades the properties of the gas.  The more sealed the container,the additives in the gas,  the temperature variation, and the temperature all affect how fast this process happens. 

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Posts

    • Someone is telling me Nils is out of auger business.  True?
    • No problem, if your looking for something pre-made just google 'speaker spacer rings'.  There are a million options for different sized speakers all pretty cheap.
    • Thank you, that helps a lot.
    • Anyone here know anything about this round?  My father-in-laws's uncle used to have a lever action rifle that shot .35 Whelen. I just did a search to try and learn more about the round and see what the gun may have been but it appears that lever action guns were never really available in .35 Whelen and it was most likely a .30-.06 that was altered.  If that is true it sure makes me want to learn more about that gun.  Does anyone here have any knowledge of .35 Whelen?  I'm thinking of getting a lever action soon and because of price and availability of ammo was only considering a .30-.30 but now am looking harder at a .35 Remington. 
    • Loaded weight 3450 lbs i think it was 450 on the tongue.
    • id rather fall through the ice and listen to tom yammer on and and on in his defensive videos.  i've got extensive hours with the proview.  no thanks.  tying cone angle to the sensitivity knob is one fo the dumbest designs i've seen.  it has application sure, but its limited
    • Well they won the 2 out of 3...keep it rolling boys
    • Do you know what model that would be? I suppose it's possible but it's just not reality. The large majority of criminals identify as Christians and that's a fact.
    • Brings back memories and reminds me of something I had totally forgotten!!   Decades ago was at a wilderness cabin with a couple guys and on of them had this carbine. I shot it a few times (open sights) and took it out for a walk next morning. Shot two deer at around 50 yards and they both dropped dead.  Am surprised the item you have in photo has a recoil pad since I do not recall any recoil at all. Always thought it was a handy little piece but never used it again and had no inclination to buy one. Do have a 10-22 of course
      (doesn't every home have one:) and other items. Many don't know Ruger makes their BIG rifle in .22 caliber with a laminated stock. Had one with nice Zeiss glass and it was a tack driver.  Don't recall what I did with it. Okay, back to standby.
    • Lots of different opinions on this topic apparently.  I've done about ever single one listed so far and the best way I've found is to lower the ice shack all the way, pop the tops on your catch covers and start drilling holes (try and be as close to the center as possible, no big deal if you're a little off).  Don't clear any of the slush just yet but place the hole sleeves down your holes.  With all the slush still there you may have to step on them to cut through the slush but it makes a really good seal.  Then I sweep what shavings have come up to the house (if any) back down the holes.  Get yourself a slush copter and start clearing your holes.  I spent the $60+ on a slush bucket and totally regret it after spending my first season hauling slush all season.  The slush copter takes 10 seconds to clear a hole filled with slush and you don't have to lift anything or scoop your holes afterwards.  By far one of the best investments I've made for my ice shack.  Never blocked my shack either but not a bad idea to at least have a spud bar with to break yourself free if you do freeze down.    For some rookie advice:  Get yourself a slush copter and a set of IC Nuts  Your back will thank you.  Also, if you have a Honda Generator it is mandatory that you get CLICK HERE to change your oil.  It makes empting your oil so much quicker and cleaner.  Other nice add-ons for a Honda generator is the extended-run fuel tank or an hour meter to keep track of hours (for oil changes).    Congrats on the new toy.  Tight lines!   
  • Our Sponsors