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Gas comes out of the elbow in the carburetor. Below is the lawnmower info:

Model No: 917.921332
Lot No.: M 01094
Serial No.: 021415

Does anyone know if there's a replacement carburetor for this model? If yes, what's the part number?

Check the parts book ( free download from B & S USA )
On most of them the elbow in a replaceable part
However there is no leaway, he replacement has to go in exactly where it needs to be because trying to adjust it will cause it to leak again