Tank Venting; Fuel Fi Lter - Husqvarna R135 Workshop Manual

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
333/335
336
502 50 83-01

Fuel fi lter

The fuel fi lter can be removed through
the tank's fi ll hole.
Tank venting
Tank venting takes place through the
fuel cap and needs to be functional for
the engine to work.
• Remove the air fi lter cowling and
dismantle the cylinder cover.
• Remove the fuel hose from the car-
burettor 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.
Model 333/335
The fuel cap can be taken apart for clea-
ning.
Use a screwdriver and press off the
housing (A) that contains a rubber
diaphragm (B) and a fi lter (C) and cover
(D).
Blow the fi lter (C) clean, and the sinte-
red fi lter (E), with compressed air and
mount the fuel cap in the reverse order
to how it was disassembled.
Make sure that the fl at surface on the
cover (D) is turned towards the di-
aphragm.
NOTE!
There is a small slit (F) in the
diaphragm (B) that becomes visible
when you carefully pull the edges
of the diaphragm. Check that the
edges of the slit are not damaged.
Replace diaphragm if necessary.
Model 336
The fuel cap can be taken apart for
cleaning.
Use a screwdriver and prise off the
housing (A).
Remove the nipple (B) using a small fl at
nosed pliers.
Blow the bleeding opening in the hous-
ing (A) clean with compressed air.
Blow clean both sintered fi lters (C) with
compressed air.
Assemble the fuel cap in reverse order
as set out for dismantling.
Make sure the gasket (D) is not dam-
aged.
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 with your fi ngers or
with help of tool 502 50 83-01.
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