18.5 HP Briggs

I don't have your engine info, but some are just a rubber tube from the engine, or valve cover, to the air cleaner housing. Other have a plate, with the tube, mounted to the engine that can be removed. Under the plate is a rubber diaphragm that should be cleaned and its functionality checked. On this type, I would replace the diaphragm and the tube if necessary. I'm thinking that if this is bad, it may cause back pressure in the engine.
 
digr said:
I took the carb off and cleaned it now it won't run at hi speed , it floods I think it is the high speed jet that was laying on the carb when I lifted the float housing off. I assumed it went into the float housing with the O ring toward the bottom of the float housing, I will take it apart again and see if the jet flipped when I dropped it into the float housing.
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my 22hp Briggs carb has two of those jets. They are different size and have to be installed in the right spot.I replaced mine earlier this summer and engine runs like new for being 10 years old.
 
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