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Old 07 January 2019, 12:39   #1
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Petrol @shelf life@

Hello All

Would anybody like to share their views on how long petrol can be stored for before it goes off/bad, causes poor performance?
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Old 07 January 2019, 13:20   #2
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Pump fresh couple of months, with stabiliser 12+ depends on many factors storage conditions, required octane, ethanol content etc etc

Underground or proper storage tanks it should last long periods, surface vented tanks subject to temp variations and moisture not so long. That said I have not had engine issues with old fuel but lots of people seem too..... for what it costs add some stabiliser you might not need it....
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Old 07 January 2019, 13:28   #3
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Hello All

Would anybody like to share their views on how long petrol can be stored for before it goes off/bad, causes poor performance?


It depends.

In plastic can, sealed, with no moisture and minimal air gap for condensation Iíve used two year old fuel with no noticeable issues.

With two stroke oil premixed some people claim weeks rather than months is all it takes for issues to start!

Many people suggest the issue is exacerbated with modern fuel that contains bio ethanol. Iíve never noticed an issue in the UK - other countries may add more ethanol or have different storage regimes that make issues more likely.
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Old 07 January 2019, 14:52   #4
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Minor thread drift. Are people storing their ribs with a full fixed fuel tank or are you running it down to low'ish then just adding fresh fuel at beginning of season. Mine is on the driveway with low fuel (about 5-7 litres) in the 40 litre fixed aluminium fuel tank ready for top up at the start of next season (so that will be 6 months in storage)?
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Old 07 January 2019, 14:59   #5
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Minor thread drift. Are people storing their ribs with a full fixed fuel tank or are you running it down to low'ish then just adding fresh fuel at beginning of season. Mine is on the driveway with low fuel (about 5-7 litres) in the 40 litre fixed aluminium fuel tank ready for top up at the start of next season (so that will be 6 months in storage)?


Lots of room in that tank for moist air to enter via vent and condense inside, a full tank of stabilised fuel that wonít happen...... but then a decent separator will remove the water, and you will have mostly fresh fuel and some stale old fuel....

Personally I try and store the tank full with stabilised fuel... right now I have a half a tank of stabilised fuel, after an impromptu Xmas run out..... not sure whether to top it off and add more stabiliser or leave it....
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Old 08 January 2019, 02:02   #6
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I think this is a subject that is exaggerated and blamed for several engine issues wrongly.

Only last week I went and started a Toyota Previa which had stood for over 1.5 years with petrol in the tank. I put on a fresh battery and off she went no issues at all. There was another thread on here recently that suggested more like a 6 year lay up on a similar car.
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Old 08 January 2019, 03:12   #7
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Interesting fact sheet

https://www.bp.com/content/dam/bp-co...icle-tanks.pdf
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Old 08 January 2019, 12:46   #8
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Here is what I do but not the definitive answer.
Here in the US we have 10% ethanol in our gas. Because some politician wanted votes from the corn farmers.
The gas goes bad faster I am told by several sources as well as the internet, so it must be true, that 3 months is max recommended storage. It gets gummy at the bottom of the tank they say.
Anyway I store about 30 gal of fuel on the side of my home in Nato metal cans. Because I live in earthquake prone region. I put stabilizer in the cans that are full. Every 6 months I rotate the gas out and replace.
During the summer I use it in my boat as well as my work generator year around. Never had a problem but I never pushed it.
My new Evenrude Etec 60hp has the in-engine fuel winterized full with "Star-Tron" brand stabilizer. And I bet Evenrude tested the different brands for the ethanol gas problem.
Now my 1980's Mercury 90hp would never start after winter with or without fuel in the carb. So some engines are more buggy about sitting and old fuel.
P.S. Do you guys have Ethanol in your petrol?
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Old 08 January 2019, 13:15   #9
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Yes we have 5-7% ethanol content currently I think but due to increase soon

https://www.esso.co.uk/fuels-faqs


Quote:
The majority of unleaded 95 Octane petrol sold in the UK contains up to 5% ethanol as required under the Governmentís Renewable Transport Fuels Obligation (RTFO).

There is currently no requirement for renewable fuel (such as ethanol) to be present in super unleaded (97 grade petrol).
Didnít know that super was ethanol free though.... interesting
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Old 08 January 2019, 13:47   #10
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Didnít know that super was ethanol free though.... interesting


Read it carefully again. They donít require to put ethanol in it - that doesnít mean that they havenít!
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