Husqvarna 2009 TE 310 Workshop Manual page 146

ENGINE OVERHAULING
Fuel draining (TC 450-510; TXC 250-450-510)
As the fuel has to be drained from the float chamber, close the fuel tap by
tightening the ring nut (A). Place the hose (3) in a vessel, loosen the drain screw
(4) on the float chamber lower side, then tighten the screw again after the fuel
drain.
WARNING
Never litter the environment with fuel, and let the engine running in open air, never
in closed rooms.
A
G.26 Part. N. 8000 H0368 (09-2008)