3

Fuel system

 

 

The pump unit

The pump unit

 

Pumps fuel from the tank to the carbu-

This is where the pump diaphragm (E)

 

rettor.

that pumps fuel from the tank to the

 

 

carburettor’s measuring unit is found.

 

 

The diaphragm is affected by pressure

 

 

variations in the engine’s crankcase via

 

 

an impulse channel (F).

 

 

If the channel is blocked, by grease or a

 

 

wrongly facing gasket, for example, the

 

 

pump unit does not function and the

 

 

engine cannot be started.

 

Dismantling the carburettor

Dismantling the carburettor

 

Remove the control diaphragm and

Carefully remove the control dia-

 

check for damage.

phragm (A) and gasket (B).

 

Replace if required.

Check the diaphragm for holes and

 

 

wear on the pin (C).

 

 

Replace the diaphragm if required.

Pressure test the metering unit.

Connect pressure tester 531 03 06-23

 

to the fuel hose nipple.

Lower the carburettor in a vessel with petrol in order to discover any leaks more easily.

Test the pressure at 50 kPa. No leakage is permitted.

531 03 06-23

20

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Husqvarna 343R, 345RX, 343F, 345FX, 345FXT manual Pump unit, Dismantling the carburettor

343R, 345RX, 343F, 345FX, 345FXT specifications

The Husqvarna 343R, 345RX, 343F, 345FX, and 345FXT are designed for efficiency and performance in demanding outdoor tasks. Each model stands out with unique features and technologies tailored to meet various needs, from professional landscaping to residential gardening.

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