When starting the engine fuel and fuel vapor, from the pump, gets into the reservoir of the vapour separator. Fuelalready in the reservoir will be forced via the riser tube to the carburettor. in this way, the chamber recives, in the first stage of a hot start, fuel which would tend not to vaporise in the float chamber.
Simultaneously, the fuel vapour is returned to the fuel tank via the open ball check valve until a continuous fuel flow occurs. Thereby malfunctions with a hot idling engine and when pulling away are counteracted.
As soon as there is a continuous flow of fuel, the ball check valve closes this assures a good constant flow of fuel by full load throttle. the bypass, in the return connection, allows a continuous, but small quantity of fuel to return to the tank. This prevents a pressure build up to the carburettor when at a standstill with a hot engine. The pressure could otherwise force the float needle valve open and allow the carburettor to flood,which in turn would tend to impede hot starts
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