No announcement yet.

Winter Storage – Full OR Empty Gas Tank?

  • Filter
  • Time
  • Show
Clear All
new posts

  • Winter Storage – Full OR Empty Gas Tank?

    With the recent introduction of the “New Gas” (gasoline that contains Alcohol) here in New England, there are now questions of how to store the boats gas tank over the long New England winter. In the past, the tank was always completely filled and a gasoline stabilizer added to help maintain the octane rating through the winter. (I am told that the same stabilizers will work with the “New Gas”).

    Should the tank be full OR empty over the winter with this “New Gas”? A few people that I have spoken to recently are now saying that because the alcohol in the gas will “collect water” from the air (the more gas the more water that will be picked up by the gas in the tank) the tanks should be kept empty all winter. ?? This goes against what I was told years and years ago and what I have practiced (full tank) with my 1973 22 MAKO over the last 25 years. Does anyone have any experience over winters with this type of “New Gas”??

    1973 22 CC Milford, CT USA[br]

  • #2
    I will be putting my boat away within the next week or so and will be filling the tank up like always. I run a fuel dock down on long island and am almost positive that i have the same ethanol fuel that you guys do up there. I received the new blend the first couple of weeks of january of this year and it lasted all winter( and it was a bad winter down here) and i had no problems with any water buildup or anything. Prior to last winter my fuel supplier wasnt sure what the effects of the winter would have on the new blend and told me to put as minimal as possible in the tank to hold over the winter. This year they are saying that there is no problem with holding as much fuel as you would like over because there were no significant problems at the beginning of this year........hope this helps a little


    • #3
      I don't know if this pertains to the "new gas" but check this article

      out. This will be the first winter that I store the boat without a full tank. Hope this helps.
      Pete[br]MaColAh III [br]93\' 261b[br]HO 200 hp ETEC\'s[br]Cape Cod[br]


      • #4
        Classicmako 73-

        Fellow New England guy here.....I think most marinas tell you to store the boat with almost a full tank for several reasons....first is that a full tank has less fuel vapor to ignite and represents less of a fire hazard and second is that there is less room for condensation to build up in your tank.

        However, my mechanic and I think that its best to run the tank down to a 1/4 full or so, then add the fuel stabilizer. In the spring, you put high octane gas in and it mixes with the old gas and balances out the octane. As far as condensation is concerned, your fuel water seperator should filter it out.

        Yes, I have heard that the new gas bonds itself to the water.



        • #5
          I'm with Ed on this one. Always used to fill up before putting her away. For the past four years or so, I've run her down as far as I can, stabilize whats left (make sure you run the stabilized fuel through the engine) and let it be.

          Your racor will grab any water from condensation, and lets face it, gasoline is not what gasoline used to be. It doesnt hold as long, I'm a firm believer in getting fresh fuel in the tank in the spring and you cant do that if its full.
          1990 261 T/2001 200 HPDIs[br]Basking Ridge/Mantoloking NJ[br]


          • #6
            Being from New England, I'm with Ed and Makorider. Newer gasoline doesn't have much of a shelflife, so you don't want a full tank of bad fuel come spring. So I do as the other guys stated, except I put the fuel stabilzer in at the beginning of the winter. In addition, I put some "Sea Foam" in my tank come spring because it disolves water. So any condensation that accumilated in the tank should get picked up by the fuel/water seperater and disolved by the sea foam.




            • #7
              seafoam is DA SHIT!! Ever since I found it and first decarbed the outboards, I've run it thru every engine I've owned. Got 2mpg and a lot of power back when I ran it thru my wrangler which had about 160K on it at the time.
              1990 261 T/2001 200 HPDIs[br]Basking Ridge/Mantoloking NJ[br]


              • #8
                By the way, NAPAs carry it too.
                1990 261 T/2001 200 HPDIs[br]Basking Ridge/Mantoloking NJ[br]


                • #9
                  Makorider, if you ever need another ax15 tranny for that wrangler let me know. I have one collecting dust, but it needs a new fifth gear ($105 in 'jeep essentials'), everything else is fine. Yeah, sea foam is great, especially if you have carbon build up in your intake. So it's great for your low reving engines like your inline 6 or 4. It's also great cuz it won't dissolve oil and burn out your rings like carb cleaner will (if you use it while running your engine), since it acts as a lube too.