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Old 24 October 2011, 07:45   #11
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Country: UK - Channel Islands
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A bit of condensation is obviously a risk, but that's what fuel/water separator filters are for. I really doubt much humid air will get into an underdeck tank over a winter period (unless it's very foggy and you have two vent pipes to allow circulation), and to date I've never worried about it. Any water that is there is more than likely from the petrol supplier's tank, not yours.

I just leave my tank at whatever fuel level is in it at the end of the season and then fill to the brim on first launch of the next season.

Diesel is a different matter, so you would brim that before storage to minimise the risk of bug.
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Old 29 October 2011, 11:08   #12
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Thanks for the advice everyone,

I'll leave the tank wherever it is c. 1/2 full top up in the spring & not worry.

Last day of our season was yesterday - and what a day - clear, no sea to speak of sunny and fanststic light. Launched Brixham and were off Teignmouth for lunch only 30 min later! Though of pushing on to Exmouth, but didn't want to tire the children too much or get back too late.

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Old 02 November 2011, 16:50   #13
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I asked the question at Redbay and they said leave it full
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Old 02 November 2011, 18:16   #14
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Stored fuel problems/ethenol !!

Hi, dont know how aware everyone here is re the probs with all the fuel companys increasing the Ethanol content in the petrol we are buying to 5%.
My other expensive hobby is motor bikes, one being an older 1970s Triumph, the whole classic/vintage motorcycle enthusiast group have been having 'Major' problems for 12 months or more with the Ethanol damaging fuel lines, fibre washers, and desolving tank sealants, blocking jets, etc, and causing engine damage, it will actually distroy a fibreglass tank !! The Ethanol actually attracts moisture, so laying up is going to become a bigger problem.If you search Ethanol on this site, and the internet, lots more info.
I have used STA-BIL fuel stabiliser in both bikes and my rib, with no bad results, I belive that there is a new form of marine stabiliser available in the States which is more effective than the form we can buy it here, and have heard it can be imported by the firm called FORCE, which build inflatables I think. The classic bike clubs I am a member of, are lobbing MPS about this problem, its one of the fuel companys biggest scams yet, and its going to get worse, unless we do somthing about it....

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