Fuel Fuel tank sensors question

I have a sumped fuel tank to run with my A1000 system on the car. When I removed the tank to get the sump welded in I had a HELL of a time removing the sensors in the top of the fuel tank. Damn near impossible to do without breaking them, which I did. When I installed the tank I bought a new Fuel tank vapor valve but could not find the other sensor anywhere (not sure of the exact name, or function). It is the one closest to where fuel pump opening is, it is longer then the vapor valve.

I talked to my tuner and they said to just plug the whole to get it tuned, would only affect filling the tank. I do have a hell of a time filling the tank, I have to fill it with pump barely open so the fuel does not shoot out of the filler neck. Now when I fill the tank all the way I get fuel shooting out of something at the top of the tank. It is very concerning.

Was wondering if any of you guys knew what the name and function of that other sensor is. I believe it is what is causing my filling and leaking issue. Thanks for the help.

Here is the vapor valve I currently have: http://www.latemodelrestoration.com/item/LRS-9593B/2000-04-Mustang-Fuel-Tank-Vapor-Valve

Mine is a 2000, so I will definitely try drilling out the vent restrictor. I can only imagine that the fuel is coming out of the vapor valve. I did not have the spilling issue until a couple of weeks ago, so it is a bit confusing. Hopefully this quick fix will take care of both issues.

Right now I do not have the vapor valve hooked to any hose, any idea where that should be connected to?

Thanks for your help wmburns!

Gas is flowing out of both as of now. If I fill too fast it comes out of the filler neck, when the tank is full it is released out of the vapor valve (I assume). Drips down the sides of the tank and onto the ground. Im almost positive that I put the vapor valve in the same location, probably not working correctly due to incorrect setup without any lines connected to the valve.