Fuel System; Dismantling And Assembling The Air Filter; Tank Venting - Husqvarna 525BX Workshop Manual

Repair instructions

7.7 Fuel system

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.
7.8 Dismantling and assembling the Air
filter
Remove the filter cover over the carburettor and
lift off the air filter. The filter (A) is made of Urethan
foam and must be cleaned with warm soapy water.
The filter (B) is a Felt filter and must be cleaned
with compressed air from the clean side to the
drive side.
A damaged filter should be replaced with a new
filter.
WARNING!
Do not clean not the filter with petrol.
Hazardous!
Assembly the air filter in revers order.

7.9 Tank venting

Tank venting takes place through the fuel cap and
needs to be functional for the engine to work.
• 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.
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- English
A
B