One of the biggest changes (if not the biggest in all) when converting a car from carb to electronic fuel injection is the fuel system. Carbs have small inner 'tanks' with fuel, injectors don't. That's why the whole system runs under a higher pressure and with the help of a fuel swirl pot, there is always fuel available, even under hard cornering. Although the plumbing is not yet finished in this pic, the concept can be explained. From right to left: a low pressure pump gets the fuel from the tank, pumps it into the swirl pot (middle) where the high pressure pump (left) can get it and route it to the injectors. Excess fuel gets back to the swirl pot which makes a closed loop. If there is still too much fuel in the system (swirl pot), the overflow goes back into the tank. Well... it's not quite as easy as that, but you get the picture. Hope so.
Cheers.
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