Air Filter; Tank Venting - Husqvarna 125C Workshop Manual

3
In addition to the fuel tank and carburettor, the fuel system consists of the air filter, fuel filter and tank
venting.
All these components interact so that the engine receives the optimal mixture of fuel and air to make it as
efficient as possible. Very small deviations in the carburettor setting or a blocked air filter have a large
effect on the running and efficiency of the engine.
The carburettor can come from several different manufacturers on our models, but the function and
repair methods are essentially the same.
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Fuel system

Tank venting

Check that the tank venting valve works
correctly.
Replace the fuel cap if the valve is
faulty.
531 03 06-23
Check that the tank venting filter is
open. Blow clean or replace the filler
cap.

Air filter

Dismantle the air filter by removing the
air filter cowling.
Clean the filter with the help of a brush
or blow clean with compressed air.
WARNING!
Do not clean not the filter
with petrol. Hazardous!
Tank venting
Tank venting takes place through the
fuel cap and needs to work to ensure
the functionality of the engine.
• Remove the air filter cover and
dismantle the carburettor cover.
• Secure the carburettor with both nuts.
• Remove the fuel hose from the
carburettor and empty the fuel from
the tank.
• Connect the fuel hose to pressure
tester no. 531 03 06-23.
• Pump up a pressure and vacuum of
50 kPa (0.5 bar) in the tank.
• The pressure should drop to 20 kPa
(0.2 bar) or revert to atmospheric
pressure within 45 seconds.
The tank venting works via a metal filter
inserted in the filler cap. It is important
that this passage is open. Blow the filter
clean with compressed air or replace
the filler cap.