Husqvarna 243RJ Workshop Manual page 20

3
18
Fuel system
The blending unit
Fuel and air are mixed here.
The pump unit
Pumps fuel from the tank to the carburet-
tor.
Dismantling
Remove the carburettor cover and the air
fi lter then blow clean around the carburet-
tor
Dismantle the throttle cable and fuel
hoses.
Dismantle the air fi lter holder.
502 71 27-02
The blending unit
In this section of the carburettor fuel and
air are mixed in the proper proportions.
The choke and throttle valves are placed
here.
In the middle of the venturi (narrowest
part of the throughput) the main jet (D) is
found.
The pump unit
This is where the pump diaphragm (E)
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
1. Remove the carburettor cover and the
air fi lter.
2. Close the choke valve and blow off
any dirt around the carburettor.
3. Disconnect the throttle cable.
4. Dismantle the fuel hoses from the
carburettor and note how they are con-
nected so that the fuel pump works as
intended.
5. Remove the screws (4) holding the air
fi lter holder.
6. Lift off the air fi lter holder along with
the carburettor.
7. Pull the return fuel line (A) out of the
tank.
8. Remove the hose between the carbu-
rettor and the fuel pump.