fuel life question

mellowyellow

Vice Admiral
Joined
Jun 8, 2002
Messages
5,327
my 22' starcraft has 2 15gal. saddle tanks, but I<br />havn't needed tank 2 in a few months. (never leave<br />port without both full) MY questions: how long b4<br />I should worry about it degrading? will stabilizer<br />still work on 2-3 month old fuel? any other additives<br />like octane boost to re-new older fuel?<br />thanks in advance,<br />M.Y.
 

JB

Honorary Moderator Emeritus
Joined
Mar 25, 2001
Messages
45,907
Re: fuel life question

Stabil will still work on 2-3 month old fuel.<br /><br />Octane booster is of no use in overaged fuel. High octane varnish is still varnish.<br /><br />You need to switch tanks on each trip, MY. That way you don't risk the fuel going bad.
 

18rabbit

Captain
Joined
Nov 14, 2003
Messages
3,202
Re: fuel life question

Fwiw, soda pop, bottled beer, and gasoline… they all have a 90-day shelf life. I’m not sure what the connection is … :)
 

CTD

Petty Officer 1st Class
Joined
Nov 13, 2002
Messages
234
Re: fuel life question

Read an article in Trailer life sometime ago, they said 6-12 months max. Hot weather will shorten it and having less than a full tank will shorten it a little too.
 

Boatist

Rear Admiral
Joined
Apr 22, 2002
Messages
4,552
Re: fuel life question

Lately I have had 20 gallons of fuel in the tank form Oct to May. I have never put anything in it and never had any Engine or Carb problem. I can not tell the difference. Even My 6 gallon 2 cycle oil mix seams fine for the same time frame. Since we have been doing a lot more snow skiing have not done much winter fishing.<br /><br />I do agree with JB to rotate tanks.<br /><br />Fuel when I was kid did not hold up well when mixed with 30 weight non detergent oil.
 

Stumpknocker

Senior Chief Petty Officer
Joined
Dec 11, 2003
Messages
774
Re: fuel life question

Fuel goes bad? Hmmm... maybe that explains the funny color in the gas I stored in 5 gallon cans when Hurricane Donna went through central Florida in 1960.
 

beezee28

Master Chief Petty Officer
Joined
Jun 3, 2004
Messages
804
Re: fuel life question

On my last boat in 1983, it had 2 alum. fuel tanks. When I first bought it from the previous owner, I found out that he only used fuel from one side and left the other side filled up and not use it. Thought I have a full tank of usuable fuel but it was a big mistake. Switch the pet **** over to use the other side and start the outboard at home and the engine came alive and then sputter and died about 1 minute later. Could not start the engine after that. Checked everything and it looks fine and then check the fuel. The fuel smell funny and siphon out alittle and the could of the fuel was like darkish brown with little bits of cork like substance floating on top. What happened was that the fuel was not used for so long it turned into varnish.<br /><br />Spend a long time getting the whole system flush out the bad fuel. Has the clean the fuel line a few time and filter at the fuel intake by the motor. Took the fuel out and tried to clean it out but never seems to completely get rid of all the corks... Put a fuel filter halfway from the tank to the motor where it is easily accessible and change that out frequently. Carried a few spare filter when I went out boating and aletrnately switch from one tank to the other. Eventually got it as clean as it can be and sold the boat not too long after that.<br /><br />Lesson learned - always check the fuel by smell and sight after not using the boat for a long time.<br /><br /><br />-----------------------<br />Once beaten, twice shy!!
 
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