I think this hose got disconnected when I had the oil changed a while back. Just noticed it the other day while installing a new AC compressor. I traced the other end back to the charcoal canister. For the life of me, I cannot see where the other end goes. must be under the cluster of solenoid valves, but I can't see it.

 

Sorry. Forgot some info. 1988 FC base NA

 

i'm not entirely sure, but look on your filler neck.

 

It goes on the base of the oil filler neck, on the rear.

 

Hmmm. There's a connector on the back of the filler neck that is already connected to a hose going to the purge control valve (which matches the diagram in my handy dandy Haynes manual). According to the diagram, it shows the hose coming from the canister connecting in the same vicinity. Is there a connector underneath the other one? The diagram kind of shows my mystery hose connecting to the engine block below the filler neck. Sound right? I just can't seem to see it or feel it. Or are there two connections on the filler neck?

 

Found it. It was on the block back behind the filler neck. The guy must have really had to work at "accidentally" pulling it out. he must have snagged it with the oil filter wrench or something.