Go Back  Offshoreonly.com > Technical > General Q & A
Fuel preservation >

Fuel preservation

Like Tree1Likes

Fuel preservation

Reply

Old 08-12-2019, 03:16 PM
  #1
Platinum Member
Platinum Member
Thread Starter
iTrader: (3)
 
scippy's Avatar
 
Join Date: Jan 2007
Location: Jackson, n.j. ~ Brooklyn, n.y.
My Boat: Kevlar 35 MISTRESS - 1976 MAGNUM 27 SPORT V 1986 - DONZI 18 CLASSIC "NEVER FORGET 9/11"
Posts: 1,703
Default Fuel preservation

Question to those who winterize their boats and the fuel you use .............how do you keep it fresh over the long winter before boating season starts up again?
I'm aware of fuel additives such as GAS-SHOK and others to stabilize & stop Ethanol/gas fuel problems over a long winter layup, but how long can you prevent
water condensation in fuel tanks before harm can occur?.......last season I switched from regular pump gas (Shell V-power) to AV 100 LL fuel mainly for the longevity
of it's fuel staying fresh and octane, but I found that my engines where running lean (EFI's 575's) which could cause my exhaust valve to burn.....What fuel do you guys
use and how do you keep it moderately fresh between boating seasons?............Anybody using 10 to 15% AV fuel with their regular gas fill ups?........Thanks, Scippy
scippy is offline  
Reply With Quote
Old 08-13-2019, 05:34 AM
  #2
Registered
 
Join Date: Dec 2013
Location: Chaumont River, Ny.
My Boat: Many,...
Posts: 391
Default

Ayuh,..... I use nothin' but ethanol free gasoline, 'n add Sta-bil to the last tank of the season,.....
Bondo is offline  
Reply With Quote
Old 08-13-2019, 06:54 AM
  #3
Registered
 
Join Date: Oct 2012
My Boat: 280 Velocity
Posts: 1,245
Default

I use marine stal-bil in every tank of ethanol pump gas. 1oz per 10 gallons than 2oz per 10 gallons for the entire tank when wintering. Also put in Startron additive when winterizing. Also do the oil soup mix in separate tank to run thru engine when winterizing. I winterize with a full tank of fuel. Never had a fuel related problem in 7 years of ownership on current boat. I still have some gas from last year in my tank, (because lack of use). I have added fuel this year but still have a few gallons of last year's fuel in tank. Engine never skips a beat.
underpsi68 is offline  
Reply With Quote
Old 08-13-2019, 08:28 AM
  #4
Registered
 
Join Date: Jun 2019
Posts: 10
Default

I put Sta-bil in both tanks before the last trip of the season. I can't fill the tanks because I store it with the front of the trailer all the way down, so the water runs off the front of the boat cover and silver tarp. I've done this for my last three boats, over 15 years, and never had a problem. The boat fires up on the first try when the warm weather comes.
Mikes56 is offline  
Reply With Quote
Old 08-13-2019, 11:02 AM
  #5
Forum Regulator
VIP Member
iTrader: (1)
 
Sydwayz's Avatar
 
Join Date: May 2001
Location: Worldwide
My Boat: 17' Speedliner Cat & O.P.B.
Posts: 22,668
Default

Star-Tron blue fuel treatment EVERY fill up.
Double up with StaBil treatment for winter lay up.

Never trust that the fuel you get is actually ethanol free. I found that out the hard way.
Tractionless likes this.
Sydwayz is offline  
Reply With Quote
Old 08-13-2019, 03:47 PM
  #6
Registered
iTrader: (1)
 
Join Date: Nov 2009
Location: KY
My Boat: 94 Formula 27PC 509, 95 232 Rinker 454
Posts: 2,275
Default

Non-E gas and nothing else in boats
I use sta-bil in anything that sits with E-10
AllDodge is offline  
Reply With Quote
Old 08-13-2019, 04:31 PM
  #7
Platinum Member
Platinum Member
Thread Starter
iTrader: (3)
 
scippy's Avatar
 
Join Date: Jan 2007
Location: Jackson, n.j. ~ Brooklyn, n.y.
My Boat: Kevlar 35 MISTRESS - 1976 MAGNUM 27 SPORT V 1986 - DONZI 18 CLASSIC "NEVER FORGET 9/11"
Posts: 1,703
Default

Short story.......My 35 Cig was restored in '96 used less than 10 hrs' then put in storage ~ fuel was never drained until I purchased it in '16 ~ used USA fuel service to drain a 1/2 tank of varnish then clean tank add new sender, fuel filters etc; etc;
a mechanic with Flagship Marine Engine Co. recommended AV fuel ~ filled up @ Punta Gorda airport ~ the engines (EFI 575'S) fired up for first time in 20 years exhaust smelled wonderful! ~ been using AV fuel ever since. ~ my concern is
O2 sensor notes engines running lean which can cause exhaust valve erosion ~ I've read where AV fuel can cause VSR (valve seat regression) in some plane engines ~ the fix was to change out valve's to hardened steel ~ my question is ~ My
plan is to introduce my engines to regular pump gas as the AV fuel burns away ~ is there any problem by mixing AV gas with pump gas?............I have Arizona Speed & Marine EFI'S (old skool stuff) atop the 575's tall boys.
scippy is offline  
Reply With Quote
Old 08-13-2019, 07:18 PM
  #8
Registered
 
Join Date: Apr 2013
Location: Lagrange ky
My Boat: 88 pachanga 22
Posts: 306
Default

i just run it low, or fill it up. add stabil and then either fill up with fresh or cruise it all the way until it has more fresh and i can run hard.
beaver 3 is offline  
Reply With Quote
Old 08-13-2019, 08:24 PM
  #9
Registered
 
Join Date: Feb 2013
Location: Austin, Texas
My Boat: 1990 Fountain Fever 29
Posts: 607
Default

I drain the tank, then add 10 gals of Av gas + 1 qt 2-stroke oil + Stabil all mixed up in 5 gal cans then poured into boat tank. Remove fuel filters, dump and re-install. Run engs until the 2-stroke smoke appears, then stall eng with oil fogging spray just as the 5 gal canister (connected to muffs) of pink anti-freeze goes dry. Winterized...
zz28zz is offline  
Reply With Quote
Old 08-13-2019, 08:31 PM
  #10
Platinum Member
Platinum Member
 
Join Date: May 2018
Location: Western Pennsylvanoa
My Boat: 2002 Checkmate 270 Convincor 496-MAG-HO
Posts: 182
Default

I have always ran my tanks empty or very low after treating the fuel for the past 20yrs with 280/300x/300xs outboards. Just didn't like starting new season with old fuel and engines required premium. Now I'm running I/O's just treating and running low for last run.
PA.WOODCHUCK is offline  
Reply With Quote

OSO Sponsor
OSO Advertiser
OSO Advertiser
OSO Advertiser