Need help identifying this on fuel filter housing

[ARYankee]

I have looked at Figure 18 in the 289-20P TM for the fuel filter housing and how it is assembled. I'm having issues with what connects to the line that I have circled in the picture. I didn't take this apart so I have no clue if anything goes there that is why I am asking here. I may be missing something in the TM which I'm hoping some one will gladly point out.

 

[O.D. Fever]

That is the air purge, with the engine running or cranking open the black knob on top ,air then fuel will come out. There shoud be a hose on it(clear) so you can see the air/fuel, and it will dump on the ground or in a bucket.

 

[boomer431]

Thats where you bleed the air from the filter. Some will have a clear tube attached to direct the fuel to a container when you bleed it .

 

[ARYankee]

Thanks. Of course after I posted this I ran across it in the 289-20 TM where it talks about bleeding the system and there it was. I figured I would have jumped the gun and posted here too quickly. I'll eventually quit that.