Small Engines (Lawn Mowers, etc.): Carberator, vacuum hose, pump fuel

Question
I have a model 351777 19.5 hp there is 2 ports for gas lines but only inlet for gas the larger port is the only one in use what goes to the second port

Answer
There should be three barbs on your fuel pump.  


Fuel Tank to Fuel Pump

Fuel Pump to Carb

Vacuum hose from pump to engine block.  Usually hooks to Valve Cover.

Hope this helps,  if you need more information, please send a followup and include the Model, Type and Code Number so I can look at the exploded parts list view.

Thanks