There's 3 lines merged into one at the bottom passenger side. One yellow 1 red 1 black all go what looks like into the throttle body. Here's a picture? The black line is completely broken off. This is a 5.4L 2v engine on a 2000 f150 that is bi-fuel.

 

https://www.f150forum.com/f6/2001-f1...nector-490199/

 

Nice find ! Looks like a simple fix.

 

what Is the fix? Lol i am no mechanic. Does it appear to you that whoever owned truck at one time spliced that 1/4inch hose off of the throttle body on the driver side (green zip tie) and routed that over to passenger side near pcv valve hose? Where would you say the broken black hose was attached to at one time? Should I just cap off the black hose?

 

Yea they changed that up in 99 and so on.. I had the 98 model. Hard to see from your pics, you don't have T pictured....just a piece of it lol.

If you look close at the pick artsr2002 posted, that line goes into a T. That where yours broke off or rotted away. Looks like you might be missing the fitting..hard to tell from here.