Fuel Pump; Carburettor - Husqvarna 326R Workshop Manual

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Fuel system

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

Dismantling
Blow clean the carburettor
compartment and disconnect the
throttle cable from the carburettor.
Remove the screws and fuel pipes and
lift off the carburettor.
The carburettor is made by Zama.
Design, function and servicing
correspond with the Walbro carburettor.
Default carburettor settings:
H = 1 revolution open
L = 1 revolution open
The carburettor needles are fitted with
movement limiters (caps).
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.
Fuel pump
The fuel pump has the task of
facilitating the start of the engine when
cold. The pump fills 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
Dismantling
1. Remove the carburettor cover and
blow the carburettor compartment
clean with compressed air.
2. Disconnect the throttle cable from
the lever arm on the carburettor and
from the guide in the air filter
connection.
3. Remove carburettor screws and the
fuel pipe.
4. Move the air filter connection to the
side, remove the fuel pipe and lift off
the carburettor.
The carburettor is made by Zama.
It has the same design and function as
the Walbro carburettor, which means
that servicing is also carried out in the
same way.
The lever arm should lie flush with the
carburettor housing's contact face.
Default carburettor settings:
H = 1 revolution open
L = 1 revolution open
The carburettor needles are fitted with
movement limiters (caps).
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
functions are located here.
The needle valve (B) and control
diaphragm (C) are vital to the
carburettor's function.