yes, if you opened up the reed valve and not the reed valve stop. this will prevent a vacum to form in the case no pulse = no fuel pump action = no fuel. take the cover back off and flip the reed valve (the thin springy metal flap) over . the thick metal bracket y thing is the reed stop bend this out carefully so a 1/8 inch allen wrench will fit between it and the reedvalve all thew way to the botom where it screws on to the back plate . or just leave it stock for now .you can allways bend it out later. this could be the sorce of air leaking sound that you heard earlyer. hope this is it. good luck!