Patent ID: 8591618

Claim:
An air cleaner for placement upstream of a carburetor in an intake system of an engine, the air cleaner comprising: a fuel accumulation part formed near, and so as to surround, a cleaner outlet provided in a cleaner bottom wall located towards the carburetor, the fuel accumulation part being adapted to accumulate mixed fuel that back flows from the carburetor; a back flow guide member that guides the mixed fuel that back flows into the air cleaner via the cleaner outlet not towards a filter but towards the fuel accumulation part; and a plurality of return flow features, each of which comprises one end that is in communication with the cleaner outlet and another end that is in communication with the fuel accumulation part so as to return the mixed fuel that accumulates in the fuel accumulation part back towards the carburetor utilizing intake negative pressure, wherein the plurality of return flow features are formed in a radial fashion about the cleaner outlet.