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.
In the fuel-injection system, used on some engines, the petrol and air are mixed in the inlet manifold .
A fuel pump draws petrol out of the tank through a pipe to the carburettor .
The pump may be mechanical worked by the engine – or it may be electric, in which case it is usually next to or even inside the fuel tank .
A mechanical fuel pump is driven by the camshaft , or by a special shaft driven by the crankshaft . As the shaft turns, a cam passes under a pivoted lever and forces it up at one end.
The other end of the lever, which is linked loosely to a rubber diaphragm forming the floor of a chamber in the pump, goes down and pulls the diaphragm with it.
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