A circulating fuel system- paul-ryan.info Vent pipe Fuel tank Outward fuel line Return fuel line Fuel pump(mechanical) Carburettor Air cleaner
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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.

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How a fuel pump works

A car engine burns a mixture of petrol and air. Petrol is pumped along a pipe from the tank...