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A circulating fuel system

A circulating fuel system Vent pipe Fuel tank Outward fuel line Return fuel line Fuel pump (mechanical) Carburettor Air cleaner

This fuel system has both supply and return pipes along which petrol circulates continuously; the carburettor draws off whatever it needs. Single-pipe systems are more usual.

Explained in

    How a fuel pump works

    A car engine burns a mixture of petrol and air. Petrol is pumped along a pipe from the tank and mixed with air in the carburettor, from which the engine sucks in the mixture. Read more