No, the tank is sealed and perfectly safe to be transported inside the stove when full.
My tip would be buy a 5L emergency plastic fuel can and half fill it (as if it's left lying around for too long the fuel goes stale after a few months).
Then buy a 1L Sigg bottle or similar (mine is made by Trangia and has a safety pressure release valve fitted in the lid).
Then, whenever you go away, fill the tank on the stove and the 1L bottle and you'll have plenty for at least a week away.
When you get home, simply top everything up again.
I would advise that if you are storing the stove with fuel in for any length of time, release the pressure by slowly unscrewing the fuel cap (whilst the stove is cold of course) - this should take the strain off any of the components in the system.
Also, if it's been sitting for a while (say a year or so) Coleman advise on rinsing out the fuel tank with fresh fuel. This is the advice provided with my new Coleman lantern when using it as an emergency stand-by (i.e. little use).
I would also advise that when you get back home after a time away with your stove, you strip it (i.e. just take the lid off and the chrome grill - which all removes easily) and wipe it with a damp cloth with washing up liquid on to get rid of any grease build up - especially when cooking a lot of greasy food that spits - bacon, burgers, etc. That way, your stove is always tip top and ready for use and should last you years. Dry it off afterwards too to avoid rust setting in.
PS: The filler funnel that comes with it, if used correctly, automatically fills the stove to the correct level leaving the right amount of air in the tank to allow it to be pressurised - you should never overfill them. Just follow the instructions!
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