Husqvarna 531RB Workshop Manual page 23

7.6.3.2 Part throttle position
7.6.3.3 High speed position
935 - 001 -
7.6.4 Gravity fuel supply
The fuel tank is installed above the carburetor. Gravity
causes the fuel to go from the fuel tank to the
carburetor. The fuel valve (B) is installed between the
fuel tank and the carburetor and stops the fuel. The
gravity fuel supply limits the product from tilted
operation. If the product is tilted too much, the fuel does
not go into the carburetor.
B
Repair instructions- 23