My FS100RX is filling up the air filter with gas when not in use. Either in a horizontal or vertical position. I tried cleaning the carb a couple times with no luck. Instead of ordering a carb kit I ordered a new carb. It didn't come in yet, so I took a good working carb off of my FS90R and put it on till it comes in. Hung it up on my trimmer rack in the shed(engine up/trimmer head down). Now its doing the same thing. What's making two carbs do this? S88 & S131B carbs. It's definitely dripping out of the air filter assy. Gas cap and tank is dry.