rollover vent valve
 

Where does the hose go to?

What state your question better

Hose coming off rollover vent valve on top of gas tank, what does it connect to?

I'm not entirely sure what you're referring to. Here's what I can remember from my recent work on the fuel and emissions systems of my Jimmy:

The filler neck goes from the gas cap down to the tank. There's a check ball in the end of the neck just before the tank. That ball is supposed to prevent fuel leakage in the event of a rollover. It's also an impediment to those who would siphon gasoline from the tank.

There's a vent line that goes from the tank up to the filler neck just before the gas cap. That's about a 3/4" rubber hose. There are small (+/- 1/4") rubber lines coming from fittings on the top of the gas tank. Those go to the charcoal canister in the left rear fender behind the wheel. There's a similar small line that goes from that canister to the purge valve on the engine. Also on the charcoal canister is about a 3/4" rubber hose that goes to the canister vent solenoid mounted above the spare tire on the frame.

Hopefully some of that will be helpful to you.

yep 1/4 inch hose going to charcoal tank ,thanks