If you run out of petrol ...when ofcouse you stall 
anyways ..the fuel guage isnt always accurate specially in last quarter in all cars categorically MB
..a friend of mine, had new mehran and yesterday the guage misleaded him and he was stranded 
Not advisable to keep fuel in cans or in anything although in jerry cans you can still keep it....BUT when the jerrycan is left for 3, 4 months, then id advise to throw the fuel as it wont be of much use:) ..ul see serious discoloration
advisable is, keep running on petrol once a week, try to maintain around half tank and try not to let it reach last quarter ..if you go on a long trip then you should completely fill up the tank to avoid any inconvienience ..now i aint considering the mentality which caters "i cant afford". Since you are keeping a car, you should be able to run it on petrol couple of times in a month and you SHOULD never run out of fuel:)