Export thread

There are 2 inlets. One thicker is for fuel but there ais anothes thinner one also. What for is that? Carburetor is 285286. In photo is in white.
Thanks in advance.

The white fitting is a mystery. Actually it is for a non existant remote primer. Briggs even gives the part number for the hose that connect to it but there is no primer and no reason for the hose.

Thank you very much!

Would be nice if the OP actual gave a valid PN.