user: Question: What is the displacement when the fuel system is carburettor, and a power of PS (kW; hp), and also has a model of 2000?
Columns: ['Model', 'Years', 'Engine', 'Displacement', 'Power', 'Fuel system']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1400', '1972-74', 'I4 DOHC', '1438cc', 'PS (kW; hp)', 'carburettor']
SQL:

assistant: SELECT "Displacement" FROM "Table" WHERE "Fuel system" = 'carburettor' AND "Power" = 'PS (kW; hp)' AND "Model" = '2000';