Air Fi Lter; Tank Venting - Husqvarna 243RJ Workshop Manual

3
In addition to the fuel tank and carburettor, the fuel system consists of the air fi lter, fuel fi lter and

tank venting.

All these components interact so that the engine receives the optimal mixture of fuel and air to
make it as effi cient as possible. Very small deviations in the carburettor setting or a blocked air
fi lter have a large effect on the running and effi ciency of the engine.
The carburettor can come from several different manufacturers on our models, but the function
and repair methods are essentially the same.
16
Fuel system
Tank venting
Check that the tank venting valve works
correctly.
531 03 06-23
Air fi lter
Dismantle the air fi lter cover by loosening
both the screws (A).
Lift off the air fi lter (B). This is made of
paper and cannot be cleaned in water or
solvents. Brush the fi lter clean or blow it
clean with compressed air.
Remove the pre-fi lter (C) which is made
of foam and wash it in lukewarm soapy
water or Husqvarna Active Cleaning 505
69 85-70.
Tank venting
Tank venting takes place through the fuel
cap and needs to be functional for the
engine to work.
• Empty the fuel tank.
• Remove the air fi lter cover.
• Remove the transparent fuel hose (A)
(return hose) from the carburettor.
• Connect the fuel hose to pressure
tester no. 531 03 06-23.
• Make sure the hose bushings in the
tank are leak tight.
• Cover the hole in the fuel cap (B) with
your thumb.
• Pump up a vacuum of 50 kPa (0.5 bar)
in the tank.
• Remove your thumb from the hole in
the fuel cap.
The pressure should revert to atmo-
spheric pressure within 15 seconds.
The fuel cap can be taken apart for clean-
ing.
Use a screwdriver and prise off the hous-
ing (A) that contains the non-return valve
(B) and cover (C).
Blow the fi lter (D) and the hole in the
fuel cap (E) clean with compressed air.
Assemble the fuel cap in reverse order to
that in which it was dismantled.
Make sure the seal (F) is not damaged.