I store my fuel in 20litre plastic containers and always leave the small vent cap slightly open, based on Ross,s information maybe the containers should be kept airtight.The fuel in the gyro tank is permanently vented therefore it made sense to vent the containers as well, any advice would be welcomed.
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and from BP fact sheet.Fact SheetFor further information:Please call the BP Lubricants and Fuel Technical Helpline on 1300 139 700.A guide to storing fuelAt BP our fuels are manufactured to rigorous quality guidelines. In addition, the fuel in the underground tanks at ourpetrol stations is replenished so regularly that storage problems rarely occur. However, in smaller storage containers suchas drums, storage problems may occur. This fact sheet contains useful information to help you maintain the quality offuels away from the petrol station.For domestic use, fuel should be stored in steel cans of 2.5 litres, 5.0 litres or in 25.0 litre jerry cans. Plastic containers ofthe approved type with the Australian Standards mark (AS2906-1991) on the bottom can also be used. Please note thatthe storage of fuel in any quantity is hazardous and this fact sheet does not include safety and legislative guidelines forfuel storage. For details on these safety and legislative guidelines for fuel storage please refer to the Australian StandardAS1940.PetrolPetrol is a mixture of many components with different properties that contribute to the performance of the fuel. Whenpetrol is kept in an open container where it is exposed to the air, it will - in time - completely evaporate. As it evaporates,the composition and properties will change because different components evaporate at different rates. This is a normalfeature of petrol and helps describe the process which takes place when it is stored in equipment fuel tanks.Petrol in sealed containersThe storage life of petrol is one year when stored under shelter in a sealed container. Once a seal is broken the fuel has astorage life of six months at 20°C or three months at 30°C.Petrol in equipment tanksThe storage life of petrol in equipment fuel tanks is one month. This can be extended by topping up with one third offresh fuel, which restores the volatile components that have evaporated.Topping up with fresh fuel will help, however it is not a foolproof strategy for engines that are used only intermittently.The following principles may also help:> Keep the tank half full to stop water vapour from being sucked in and condensing.>Consider using a fuel that contains anti-oxidants, metal deactivators and corrosion inhibitors to protect metal surfaces;such as BP Ultimate.> Use a hotter spark plug to help to reduce carbon deposits
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