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Old 24 November 2010, 15:07   #1
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How long does mixed 2 stroke fuel last?

Simple question hoping to find a simple answer,
I have a mariner 3.3 2 stroke that runs at 100:1 and also a seagull that runs at 10:1.

How long will the premixed fuel last in the jerry can or fuel tank?

Thanks
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Old 24 November 2010, 16:14   #2
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Originally Posted by lockieboi View Post
Simple question hoping to find a simple answer,
I have a mariner 3.3 2 stroke that runs at 100:1 and also a seagull that runs at 10:1.

How long will the premixed fuel last in the jerry can or fuel tank?

Thanks
6 months top!
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Old 24 November 2010, 16:28   #3
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Chuck it in the car and top off with fresh fuel to dilute.

No point hanging on to it
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Old 24 November 2010, 17:00   #4
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Thanks for the replies.
Is it really o.k to put it in a car even mixed with oil at 10:1
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Old 24 November 2010, 17:08   #5
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Just put a few litres in each time you fill up, it'll be fine
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Old 24 November 2010, 17:10   #6
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Quote:
Originally Posted by lockieboi View Post
Thanks for the replies.
Is it really o.k to put it in a car even mixed with oil at 10:1
Yes, if you dilute it well enough. I know some that do. I have twin cats in my ride so for the fivers worth of oily petrol, I just burn it off in a drum, if I get caught with an excess...

And being somewhat Scroatish, I generally don't!
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Old 25 November 2010, 04:16   #7
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6 months????? whose petrol do you guys buy?

The seagull will run on pretty much anything you pour into it's tank(*), and the Mariner will likely be only marginally less fussy.

I've run a twin pot carbed Johnson 25 on fuel that turned out had been sitting for over a year, and it fired second pull. Granted it was slightly more smoky with the old fuel, (I assume due to evaporation of the petrol side of the mix) but it still ran.

Any premix engine below about 5 hp will have one cyl, one carb and one mechanically induced spark. No emissions monitors to shut it down coz you are killing the rainforests, just give it a shake to make sure the oil / fuel hasn't separated out.



* figuritively! It will be a lot less fussy than a modern 4- stroke, but don't try & run it on dirty dishwater or something equally daft. I include this "state the obvious" so that in 20 years someone searching the forum doesn't do something stoopid!
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Old 03 December 2010, 19:04   #8
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How about Petrol

I am glad I came accross this thread.
Following on from this , can anyone tell me how long pertrol lasts?

Thanks in advance.

Lee
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Old 04 December 2010, 11:12   #9
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it depends on how its stored. Unleaded not as long as leaded, more water content etc, we are still running vintage cars on fuel that was put in 5-6 years ago, it has a stale smell but still goes ok, Unleaded fuel you would be lucky to get 2 years out of it, I tried to start a LG6 Lagonda on U/L fuel approx 18 months old, stale smell. but just would not start, had to mix some fresh in. it really also depends on what the fuel is in also.
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Old 04 December 2010, 12:09   #10
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I've used fuel that has stood for 6-7 months and its been fine, I think alot could depend on what engine you have?
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