For Ford F100 F150 F250 F350 1965-1985. 4.9 L 300 cu. 4.1 L 250 cu. 3.3 L 200 cu. Carburetor structure: Components of Carburetor usually include a storage chamber for liquid fuel, a choke, an idling (or slow-running) spout, a main spout, a venturi-shaped air-flow restriction, and an accelerator pump.