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Storing car? Tank full or half full

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mick:
Ive got an interesting Question here.

The other day I was topping my petrol tank up in the vette to a perfect full tank because i was not intending to drive it for a while.

My mate who was there at the time suggested i would be better off leaving the tank half empty, he could not tell me why only that his dad always did it with his cars when he stopped using them for a while.

Which is the best way ?

gtc:
I've read advice somewhere that the tank ought to be full for storage, and MotorEx requires exhibitors to have a full tank before leaving their cars in the exhibition hall, presumably to do with minimising risk of explosion due to fuel+air mix.

However, modern unleaded petrol doesn't seem to last very well more than 6 or so months in the tank, so there's that to consider.

77CVT:
Premium fuel starts going off after 3 weeks apparently.

I'd leave a full tank for long time storage, but after 4-5 months I'd use it for the mower and refill it.

Shane Finn:
My dad used to run an Aviation fuel franchise and once told me the reason for filling the tank was to reduce the amount of air in the tank so there was less water for the fuel to collect from the air.

Basically fill the tank so there is less water absorption from the smaller quantity of air.

mick:
Its looking that i did the right thing, cool.    

I only ever leave her for about 6 weeks or so usually without taking her for a run.

;46

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