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Point of fuel cells is keep car from having fuel starvation
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That's the job of the surge tank actually, the fuel cell itself however may have baffles in it depending on its manufacturer. A small number of the fabricated ones here come with internal surge tanks and provisions for internal pickup followed by a sender to the fuel rail. Some people pair the fuel cell with a surge tank then route to the engine via AN-12 lines as well as fittings.
Yes, you can take your tank out and fit the cell in place of it. However, you'd need to make up a cradle to hold it in and that cradle should be fastened to the original mounting points for the original tank. Also, the cell should be doubly reinforced against penetration so you're looking at making up a second aluminium skin, especially if the tank's the plastic sort AND located under the car.