Hard to refill gas tank have to pump real slow car runs fine

run the fault codes
indicates a problem in the EVAP vent system

Eloy, if the pumps are heating up, you must be running with very low fuel in your gas tank, fuel is a must to keep pump cool and lubricated or you are continually getting bad pumps. Clean tank thoroughly,replace the sock on end of pump, replace fuel filter check to make sure there are no pinched collapsed fuel lines.Try running gas tank no lower then quarter tank and buy a quality replacement pump and give it a try.
http://www.automotiveforums.com/t246788-overheating_fuel_pump_anyone_.html
Chevrolet Fuel Pump Failures Explained on YouFixCars com
http://alt.autos.gm.narkive.com/t828G3rB/why-are-gm-fuel-pumps-so-short-lived-class-action-lawsuit

23 psi is no where near enough to run let alone get past the regulator so no gas will return to the tank. Need 40 to 50 psi to run. So either you have a fuel leak could be in the tank or a line. Or the pump is junk

You have a high pressure fuel pump in the tank the engine must be off when fueling and you must run the pump slow because the force of the flow causes the pump to click off also when you turn the gas cap to remove it do you here any noise a swoosh sound and is the cap very hard to turn to loosen it if so your getting vapor lock and your fuel pressure regulator is bad but it just might be the high flow pressure from the gas pump try another gas station and again run it slow if the same thing happens investigate the fuel stem this is where you put the gas in but at the tank side check the rubber hose it maybe bent was the car in a rear end collision that you know if? If so the tank could be misaligned causing the bending of the stem/hose post back with more info ok and I'll get you there I just need you to go through the process of elimination and I'm a taxi mechanic in NYC with 50 years experience in all fazes of automotive repairs collision work to ok remember that I'm not there at the vehicle so you need to be my eyes and ears ok thanks Stephen

Hello: This code indicates a problem with the evap system vent valve. A stuck closed vent valve will affect the fueling, if air can,t get out of the tank while fueling you will have a hard time filling the tank. You didn't say what year/model you have so the valve may be near the fuel tank or inside the tank. This problem should not affect fuel mileage.

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.)

u'll have to drop it full then. or u didnt get enuf gas in the hose. use a clear hose so u can see the gas and **** real slow till you see gas then put down to ground fast till it starts flowing, good luck

You might have killed your fuel pump. It's said that if you let the tank get too low or run the pump dry you can ruin it. I would see about getting a fuel pressure tester to check it.

It should be under the car, back by the gas tank

Here is the sad news, if you ran the truck out of gas chances are you destroyed the electric fuel pump in the tank, why? the fuel pump is very small, it is able to do it's job only because it is cooled by the gas it is submersed in, if you run out of gas or run very low allot it ruins the bearings in the pump and it freezes up, u will need to drop the gas tank and install a new fuel pump, I see this ALLOT!