whats this part on fuel tank?

I have the bed off my 96 Ext Cab 4x4 getting ready to do rusted frame repair and I find that the parts on my fuel tank are badly rusted , the one housing that hold the pump and sender is rough but I think ok but this other part is rusted real bad (pic is not my tank) what is it ? Thanks !!

 

i think it is a vent, probably to the charcoal canister.

 

It is the fuel evaporator tube. The part # is 7738026010 and should be under 20 bucks. I think the technical name for it is cut off valve.

 

That's where you insert the time delay fuse for the self destruct mod.

 

Thanks !