Needs some help here guys

Hi I have a 2 yr old Murry mower with a B&S engine 500 E series. My question is this: It wouldn't start, and I noticed a nipple sticking out of the carb where a 1/8 hose at one time was connected, so I figured that was the prob so I got a hose for it, now I cant figure out where the other end goes onto...I have looked at Youtube videos, asked people etc. I found a msg board that said one in goes to carb, and the other goes in behind primer bulb...I see nothing to connect it to at the primer bulb, all I see is a lil hole behind the bulb with a screen in it, nothing to connect a hose up to...anyway I sure hope you can help me, this mower only has about 6 hrs on it. Thanks Dave

Needs some help here guys