I have a fuel cell in my CRX in ITA. I used an ATL 12 gal cell with an internal sump. The cell has to have an outlet, vent and return line fitting. To provide fuel I used two pumps, a high volume Holley centrifugal pump and a Bosch high-pressure pump. The Holley pumps to the Bosch, which provides the high pressure, needed at the injectors.
The pumps are powered by direct hot wire from the battery to a 30-amp relay, which is controlled by the stock fuel pump wiring. It worked perfect from day one.