Tank Unit; Venting The Fuel Tank - Husqvarna 555 Workshop Manual

Repair nstructions

7.15 Tank unit

WARNING!
The fuel used in the chain saw has
the following hazardous properties:
1. The fluid and its vapour are poisonous.
2. Can cause skin irritation.
3. Is highly inflammable.
Dismantling
1. rain the fuel from the tank.
2. Remo e the cylinder co er, the clutch co er, the
chain and the bar. See the
ismantle the carburettor as outlined in
mantling the carburettor .
3. Loosen the hoses A to . See gure 50.
4. Loosen the screws . See gure 51.
5. Loosen the mo ement limiter H. See gure 53.
6. Pull out the hoses A to
burettor compartment. Unhook the throttle cable,
E, from the intake bellows before pulling out from
the bottom of the carburettor compartment.
NOTE!
Exercise care so that the fuel hose and
throttle cable are not damaged.

7.16 Venting the fuel tank

The two-way al e has the following properties:
Controlled opening pressure in both directions,
which pre ents a positi e pressure or a acu-
um de eloping in the fuel tank and impairing
engine performance. This also pre ents fuel
leakage.
pening pressure outward 100-450 mbar.
pening pressure inward
70 mbar. 2 locations
Test
Opening pressure outwards:
1. pen the tank lock and lea e it open during the
entire test. rain the fuel from the tank.
2. Loosen the positi e pressure hose as outlined
in gure 54. Connect the pump, ref. no. 531 03
06-23, to the tank al e .
3. Switch the pump to acuum mode.
4. After pumping the indicator should be between
10-45 kPa.
Opening pressure inwards:
1. pen the tank lock and lea e it open during the
entire test. rain the fuel from the tank.
2. Loosen the positi e pressure hose as
outlined in gure 54. Connect the pump,
ref. no. 531 03 06-23, to the tank al e .
3. Switch the pump to pressure mode.
4. After pumping the indicator should stop at ma .
7 kPa.
42
- English
perator s Manual.
is-
in the bottom of the car-
acuum ma .
ig 50
ig 51
ig 52
ig 53
G
G