I just bought a used Lawnboy, model 10262. It is doing an odd thing I have never seen a mower do. when it runs, gasoline sprays into the air filter area. This is coming from a small tube that runs from the engine to the air filter, almost like an air recirculation tube. (I am new to Lawnboys, so don't know what this tube is for). The mower will only run with the air filter element removed. I am assuming that it needs this to get a lot of air, otherwise it is way too rich, due to the gasoline being sprayed into the air filter compartment. There also seems to be gasoline getting into the exhaust muffler area, because on initial start up, it sprays some gasoline out of there, too. The engine seems to run pretty well, as long as the air filter element is removed. This makes me think it is not a major internal issue in the engine, such as a stuck or broken valve, but don't know. Any ideas of why gas is going these places it doesn't belong?