1998 Chevrolet Blazer Fuel

I recently changed the heater core and took the vehicle to get gas. It was fairly low on fuel, that the light was on. I put in 35 dollars which brought it up to 3/4 of a tank, started the vehicle and it was normal and running fine. A friend pulled up to the pump next to me, we started chatting for about 3-5 minutes, then the engine started coughing, choking, sputtering and shut off. When I tried to restart the vehicle it would not stay running. I tried for 10 minutes then it started and ran perfectly fine. I get home shut the engine off and tried to start it again, same thing wouldn't stay running or start on some tries. Then with the turn of the key it fires up and ran fine. It seems like once the fuel system pressurized it would start and run. I don't know what the first code was that came up, but it was something with evap intermittent voltage or something to that effect. The reported fix was fuel pump. My father cleared the codes and I drove it for a day and now it has codes PO171 and PO174. Could all this be the fuel pump.