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as fuel cells are made for cars in high performance situations, and your cell is either front or rear, to the rear. as you accelerate hard, fuel will go to the back of the cell, where the sump is.
if you had a circle track car, you may want a side sump to keep fuel to the pump during hard cornering.
just my .02 worth; i have only had 1 car with a fuel cell, a 70 cuda