Originally Posted by
Lee Reynolds
Totally different. A jerry can only has air present at the neck hence why it only burns the fuel there and doesnt all go up!
A petrol tank DOES have air in, as it is not a sealed unit, it has a breather otherwise it would collapse inwards due to vacuum!
A petrol tank has a breather but it's not an 'open' valve, otherwise all ya petrol would disappear in vapour!
The oxygen content is too low to allow the petrol to ignite.