one of these fuel cells is usually a large surge tank (approx 5L) filled with foam, not just foam in a normal tank.
ever used a sponge? its hard to get all the liquid out of it. image that in a fuel tank, it wouldn't do any better than a tank with no baffles because when it gets down to the last 1/4 of a tank you wont be able to get ANYTHING instead of getting an irregular ammount of fuel.
