Yea the vent line is hooked up to the muffler just not sure if it is aiming up like it should. I was when I put it in but I have a tendendsy to mess with things and make sure it si right and I may have moved it. But sometimes I can touch the back plate sometimes I can't depends on my tuning but I have tryed tunning and tunning and tunning. But the fuel maybe old plus I mixed two fuels but only after it was running this way anyway. But my fuel maybe have stuff in it I can see grass or something in the bottom of fuel but I have a filter on pump I think so didn't think that would matter.