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Virtually all two-stroke model glow engines spit a little bit of fuel out of the carburetor while running normally. Some folks use a venturi extender (pipe that raises the air opening away from the needle valve spray bar) or an air filter to capture the errant fuel and to let it be ingested by the engine. It saves making a mess on the model, however, many times, the air filter will reduce performance a bit. Not so the venturi extension.


Ed Cregger


***There are also fuel filters. That is what some of the folks responded to, thinking that you were referring to fuel filters. Like some of them, I filter my fuel several times on the ground and do not fly a fuel filter around in my model. Do whatever makes you happiest.