The fuel hose with the filter on in the tank, goes to the fuel inlet elbow on the carb, closest to the metering cover held with one screw, the other elbow on the carb goes to the short suction side of the primer bulb, the longer pressure side of the primer bulb goes back to the fuel tank, so, the bulb pulls fuel from the carb and dumps it back into the tank, not the other way round.
Husqvarna man, April 2010