So I took the screws out of the fill neck and pulled it off of the hose. At the end of the metal neck was a 3 prong plastic piece with a green ball that could move up and down the fill neck about 2 inches. There was no spring. So the problem of the design is if you are pumping gas, it;s suppose to push the ball down, opening up the hole. However it doesn't unblock enough area to be able to pump very fast.
So I pulled the ball out all together. I'm going to look into another option to put in the line to close it off if the trailer were to turn over because I get the safety feature of it.
