Fuel Fi Lter; Fuel Pump; Carburettor - Husqvarna 243RJ Workshop Manual

Fuel system
Fuel fi lter
The fuel fi lter can be removed through the
tank's fi ll hole.
502 50 83-01
Clean the fi lter externally if it is not too
dirty.
Replace the fi lter if required.

Fuel pump

The fuel pump facilitates cold starts.
The pump cannot be repaired and must
be replaced if it stops working.
Note how the fuel hoses are connected to
simplify assembly.

Carburettor

The carburettor's design
The carburettor can be divided into three
different functional units: the metering unit,
the blending unit, and the pump unit.
The metering unit
The needles and the fuel control functions
are located here.
NOTE!
There is a small slit (G) in the non-
return valve (B) that only becomes
visible when you carefully squeeze
its sides. If the valve is undamaged,
the slit is not visible in its normal
position.
Replace the non-return valve if
necessary.
Fuel fi lter
The fuel hose in the tank contains a fuel
fi lter. It is accessible through the fi ll hole.
Pull out the fi lter using tool 502 50 83-01.
If the fi lter is not too dirty, its surface can
be cleaned with a brush.
Otherwise it must be replaced.
Check the fuel hose for cracks and leaks.
Make sure that the fi lter's connection neck
is inserted as far as possible into the fuel
hose and that the O-ring is suffi ciently
tight so that the fi lter cannot slide off the
tube.
Fuel pump
The fuel pump has the task of facilitating
the start of the engine when cold. The
pump fi lls the carburettor with fuel before
attempting to start the engine. This also
prevents vapour bubbles from blocking the
narrow fuel channels.
If the pump does not work it must be
replaced.
Note how the fuel hoses are connected to
simplify assembly.
Carburettor
The carburettor's design
The carburettor can be divided into three
different functional units: the metering unit,
the blending unit, and the pump unit.
The metering unit
The needles (A) and the fuel control fun-
ctions are located here.
The needle valve (B) and control
diaphragm (C) are vital to the carburettor's
function.
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