Fuel line fitting?

[Mayday]

I’m doing prep on my car and found this. Is it a third filter I need to service, in addition to my pre and post filter? Or just some type of union joint on the fuel line?

 

[Mayday]

Hers the pic

 

[rivermobster]

Inline filter for sure. First link I found...

Pardon Our Interruption

 

[Mayday]

Inline filter for sure. First link I found...

Pardon Our Interruption

Thanks @rivermobster

 

[Sandkist]

Maybe a check valve.

 

[Mayday]

Maybe a check valve.

 

[Mayday]

Yep.
My dumbass didn’t notice it was on the vent tube

 

[rivermobster]

We are learning shit today!