Creating suction

Creating pressure

Supply correct quantity of fuel

Allow the fuel to suck and deliver

Air filtering

Engine vacuum

AC fuel pump pressure

Carburettor air-horn pressure

Spring pressure on diaphragm

Maximum stroke of diaphragm

Size of the pumping chamber

Maximum deflection of diaphragm

Decrease the fuel pressure

Excess supply of fuel at idle

Always holds correct level of fuel

Controls the air flow of the engine

Filter the fuel

Always holds correct fuel

Excess supply of fuel at idle

Controls air fuel mixture into the engine