Briggs And Stratton 19r6 Fuel In The Crankcase Of My Briggs & Stratton Engine?

Fuel in the crankcase of my briggs & stratton engine? - briggs and stratton 19r6

I am getting fuel into the crankcase of my age Briggs and Stratton lawn mower. It has a distance from the fuel pump and wonder when I replace the tubes if I am wrong. Hopefully it's the matter? What should I check? This is an 8-hp model 192,402 Type 1132nd