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Actually it is important so that you can use the full capacity of your tank without fuel starvation.
What you can do is a tank in tank set up, where you have a "swirl pot" around the main (pressure) pump with a low pressure feeding into the is area, any over flow just runs out of the top (the bottom is sealed, to the floor of the tank, the top isn't) the return can also come into the "inner tank" or not, not that imortant... better if it does for supply purposes but sometimes hard in a production car.
This can quite easily save you carrying an extra 15kg of fuel which is dead weight and is easy to do, after all parts are production and all you are adding is one low pressure pump, and a ring. Most tanks have a nice hole in the top for easy access as well.
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