hi Dave

i am running a YS 160DZ, it ran perfectly for 50 flight. but it has a died stick yesterday. it quit to suck in fuel when i tried to restart it. when i turn the prop the fuel ran back to fuel tank instead of getting in the engine. i checked fuel lines, fuel tank and filters, but all of them works well. then i loosen the screw two turns, the fuel cld be suck in the engine, but i can't get it start. then i turn the screw back to it old place. i worked well again.

today i have the same sucking problem, it seems i have to adjust the screw every time i start the engine. pls let me know what the problem it is

BTW, it is very very hot this day in my place.