Fuel tank hose size
 

On a 72gp, what size are the hoses that come out of the tank?

Thanks!

My 70 Model J 400, has 3/8 from main to fuel pump and 5/16 for the return.
Just replaced the tank, sending unit, steel lines pump when I had the carb rebuilt.
Not sure if same for your 72 but I would expect it to be.