Carburetors use a venturi, this will accelerate the air and cause the pressure to decrease. This will suck the fuel in (often assisted by a pump) and vaporise it, at least partly.
A fuel injection system will use injectors to inject the fuel. Usually there is one injector per cylinder, they can be placed in the combustion chamber, intakerunners or the intake manifold. The amount of fuel going to be injected is "calculated" mechanicly or electronicly so it's going to match the airmass the engine will consume.
Rear double wishbone suspension from a Sauber F1 car. The carbon fibre wishbones are fitted to the gearbox, the shockabsorbers are activated by pushrods:
http://www.bubeck-modellbau.de/image...u_bild3_gr.jpg