Check out the last picture in post #137 in this thread. Its a 142; but, its a B20E engine - same as yours. You can see the hose from the oil filler cap going over to the nipple on the top center of the intake manifold. The hose from the top of the breather / flame trap box should go to a fitting on the air filter box somewhere (so that clean air enters the engine). In the photo, you can see the hose from the breather / flame trap where it crosses the engine just in front of #1 injector and to the left of the oil filler cap. It goes to the bottom of the air filter housing which is that round black plastic thing in the bottom right of the photo.
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