Tank Unit; Aerating The Fuel Tank - Husqvarna 455 Rancher II Workshop Manual

7.15 Tank unit

WARNING!
The fuel used in the chain saw has
the following hazardous properties:
1. The fluid and its vapor are toxic.
2. Can cause skin irritation.
3. Is highly flammable.

7.16 Aerating the fuel tank

The two-way valve has the following properties:
• Controlled opening pressure in both directions,
which prevents a positive pressure or a vacu-
um developing in the fuel tank and impairing
engine performance. This also prevents fuel
leakage.
• Opening pressure outwards 100-450 mbar.
• Opening pressure inwards (vacuum)
max. 70 mbar.
Test
Opening pressure outward:
1. Open the tank lock and leave it open during the
entire test. Drain the fuel from the tank.
2. Connect the pump, ref. no. 531 03 06-23, to
the tank valve. See figure 52.
3. Switch the pump to vacuum mode.
4. After pumping the indicator should be between
10-45 kPa.
Opening pressure inwards:
1. Open the tank lock and leave it open during the
entire test. Drain the fuel from the tank.
2. Connect the pump, ref. no. 531 03 06-23, to
the tank valve.
3. Switch the pump to pressure mode.
4. Pump 3 times.
5. After pumping the indicator should stop at
max. 7 kPa.
Fig 52
Repair Instructions
45
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