Does anyone have a problem with gas boiling out when you are pumping gas if so how can this be fixed?

4 cans will be too much
it makes the compressor pump liquid instead of gas and that damages the compressor
it the compressor is still capable of pumping gas then it will go to high head pressures and that will switch the compressor off
you have wasted your money, run the risk of expensive compressor damage , didn't fix the leak that required the gas
The specialist ac shops are not there to take your money but to give you a system that runs without problems so use them to fix the faults and put the right amount of gas in using gauges not cans

Looks like you have a leaking head gasket or cracked head. You can buy a head gasket leak detector kit that will let you know if there is CO2 gas escaping through the radiator. I think that it is this gas leak that makes it look like your radiator is boiling.

remove thermostat if still not running cool , then timing out or head gasket blown .

Yup, evap canister related. Replace the gas cap first, then replace the evap vent valve, then the evap canister. Replace 1 at a time till you fix your problem. If problem persists, report back.

Vapor lock is when a fluid in a closed system, such as in a hydrolic system, gets get hot enough to boil and produce vapor which unlike a fluid can be cimpressed thus rendering hydrolic systems inoperative. Fluids act as a solid when pressure is exerted on to them but in their gaseous state (vapor) they can be compressed and the pressure needed to move pistons is instead absorbed by the gas rather than applied to the pistons.

Not sure but maybe the fuel pump is very hot making the fuel boil. Maybe check to see if the tank is hot, ( touch it ) if it is the fuel pump or the fuel filter needs to be changed. The pump is very powerful and with the filter clogged up it'll work real hard to deliver the fuel at the correct pressure. This will make the fuel ump real hot hick may make it boil the cool fuel added. Does it do this if the tank has more fuel in it? A fuel pump that's getting this hot isn't a good thing and should be followed up on. The other thing that might be happening is the fuel inlet hose is picnced and the fuel is being reversed. But it seems like the lavel won't matter. Maybe the tank is'nt venting corectly and the tank is being sucked flat as it emplties and as it fills it goes back in shape. ( alot less likly.)

The sensor is bad. Unfortunately the only fix is a new fuel pump. The pump and sensor are a 1 piece deal. The cost of a pump is $300-$500 plus installation. Unless you know somebody that gets a discount on car parts. Looking around 1-2 hrs for installation.

Rusted out gas lines or ruptured line from removing gas tank.

the easiest thing to try would be the thermostat.
Are your fans coming on?

Remove the gas cap when it does this. If you hear a woosh sound the tank vent isn't working properly. Essentially your tank has turned into a vacuum.