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Old 01 April 2016, 13:56   #1
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Old petrol

Just realised I've got 10 ltrs of unleaded in a can which is 6-7 months old.
Is it ok to use this in my 2st 25 Mariner? or just add a bit to each tank of fresh fuel.
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Old 01 April 2016, 14:03   #2
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I'd mix it with a little fresh, will be fine
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Old 01 April 2016, 14:06   #3
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I have had three great days using my 3.3hp two stroke mariner this year.. on fuel I mixed 50:1 and have kept since last September. Ran a sweet as always.. its up to you what you do
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Old 01 April 2016, 14:30   #4
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Stablise it if not sure but should be ok still I have only had trouble after 12 months it was easy when I had a petrol car it got put in there to get home
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Old 01 April 2016, 15:00   #5
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it will be fine
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Old 01 April 2016, 15:11   #6
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I've never had an outboard not start or play up on fuel up to a year old. However it may not run at it's best so I try and mix 50/50 with new and get it used that way.

Must admit one advantage to me with moving to 4-stroke is that we run two petrol cars here and I can put left over fuel in the cars after each trip meaning the outboard is using new fuel all the time.
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Old 01 April 2016, 18:54   #7
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I was told the part of the fuel that degrades is the lighter more volatile part which assists cold starting
So my theory is if it starts it's fine
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Old 02 April 2016, 07:48   #8
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Thanks for your replies gents, I think I'll just add a bit of the old fuel to each tank of fresh.
Wasn't sure if the old petrol could damage the engine but you have put my mind at ease thanks.
Jim
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Old 02 April 2016, 13:13   #9
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Are you sure that boating is for you if you are bothering about 10 of fuel
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Old 02 April 2016, 14:09   #10
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Quote:
Originally Posted by Sutty View Post
Are you sure that boating is for you if you are bothering about 10 of fuel
It's the age of the fuel that the OP is concerned about - not the volume. The answers apply just as much to the 300L of petrol you probably have lying in your own tank!

The OP may have no conventional way to get rid of unusable petrol (if such exists ) - diesel car, electric garden tools...
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