Husqvarna Chain Saw 用户手册

English – 

31

The primer pump is designed to make it easier to start the
engine when cold.
The pump fills the carburettor with fuel before an attempt is
made to start. This also prevents bubbles of vapour from
blocking the narrow fuel channels.
If the pump does not work it must be replaced. Note the way the
fuel pipes are connected in order to simplify assembly.