Cannot fill car with gas?

Had the car a year. The car runs good. No misfires. But gas mileage is suffering. Fuel level never worked. Pulled tank 1/2 way down. Disconnected entire Evap system except purge line. Still won't take gas. Brand new vent valve is still connected to electricity, but not to canister. The Evap line from fuel module to canister is disconnected. I blew air through it watched the tank expand. 1 minute later that Evap hose started dripping gas. The canister had 20 ounces of gas, but air can go through it - maybe it's toast from overfilling filler neck 100 times. All Evap lines and filler vent tube are clear. The only things left to mess with is the module and tank inlet, and a smoke test. 1)I need to know what the Evap hose is doing inside the tank. 2) Is there a check valve in the pump module? Gas pools heavy around the tank inlet. It's like something is stopping gas from going in the tank. 3) Do you know if my tank has vents connected to that in tank Evap hose. Just recently seen this in someone's tank. Gas gauge always says full recently, I'm thinking it tells a tank check valve to close - the tank is full. But only 1-2 gallons are in it. Thanks for your help.