Originally Posted by
Mal.
Try getting a jerry can of petrol and putting a lighter to it. It won't explode, just burn the fuel out the neck of it!
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!