The fuel lines on my Ryobi Lawn Hornet mark III popped off the tank nipples (the lines had become soft and swollen).

I took a while for me to get around to purchasing new fuel lines and now I have forgotten which goes where.

One of the tank nipples has a filter or one way valve inside the the tank. The other is just a plain nipple on the tank.

Is the plain nipple connected to the bottom of the carby or is it connected to the priming bulb.

Thanks in anticipation.