Husqvarna 966451906 manual Tank unit, Venting the fuel tank, Test Opening pressure outwards

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. Drain the fuel from the tank.

2. Remove the cylinder cover, the clutch cover, the chain and the bar. See the Operator’s Manual. Dismantle the carburettor as outlined in “Dis- mantling the carburettor”.

3. Loosen the hoses A to D. See figure 50.

4. Loosen the screws F. See figure 51.

5. Loosen the movement limiter H. See figure 53.

6. Pull out the hoses A to D in the bottom of the car- 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 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 outward 100-450 mbar.

• Opening pressure inward (vacuum) max. 70 mbar. (2 locations)

Fig 50

Fig 51

Test

Opening pressure outwards:

1. Open the tank lock and leave it open during the entire test. Drain the fuel from the tank.

2. Loosen the positive pressure hose as outlined in figure 54. Connect the pump, ref. no. 531 03 06-23, to the tank valve J.

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. Loosen the positive pressure hose as outlined in figure 54. Connect the pump, ref. no. 531 03 06-23, to the tank valve J.

3.Switch the pump to pressure mode.

4.After pumping the indicator should stop at max. 7 kPa.